1967-72 Chevy Pickup - Speedway MotorsUse dimensions provided on Page 23. NOTE: Center louver may...

1967-72 Chevy Pickup without Factory Air

751170

901149 REV D 7/30/14, INST 67-72 CHEVY PICKUP wo AC EVAP KIT PG 1 OF 24

an ISO 9001:2008 Registered Company

18865 Goll St. San Antonio, TX 78266 ph: 210-654-7171 fax: 210-654-3113


Table of Contents 1. Cover 2. Table of Contents 3. Packing List/Parts Disclaimer 4. Information Page 5. Wiring Notice 6. Engine Compartment Figure 1 7. Condenser Assembly, Compressor & Bracket, Passenger Compartment Figure 2 8. Defrost Duct and Louver Installation Figures 3, 3a & 3b 9. Fresh Air Cap and Firewall Cover Installation, Bracket and Evaporator Hardline Installation Figures 4 & 510. Bracket and Evaporator Hardline Installation (Cont.) Figure 611. Evaporator Installation Figures 7 & 7a12. Drain Hose Installation, Lubricating O-rings, A/C Hose Installation Figures 8 & 913. Heater Hose & Heater Control Valve Installation Figure 1014. A/C & Heater Hose Routing Figure 1115. Final Steps Figures 12 & 12a16. Control Panel & Duct Hose Routing Figure 1317. Wiring Diagram18. Gen IV Wiring Connection Instructions19. Operation of Controls20. Troubleshooting Information21. Troubleshooting Information (Cont.)22. Driver/Passenger Side Louver Template23. Center Louver Template24. Evaporator Kit Packing List


Evaporator Kit (751170)

1

Accessory Kit791170

2

No. Qty. Part No. Description

NOTE: Images may not depict actual parts and quantities. Refer to packing list for actual parts and quantities.

Gen IV 3-Vent Evaporator Sub Case

w/ 204 ECU744005

Gen IV 3-Vent Evaporator Sub Case w/ 204 ECUAccessory Kit 67-72 Chevy Pickup without A/C

1.2.

11

744005791170

** Before beginning installation, open all packages and check contents of shipment. Please report any shortages directly to Vintage Air within 15 days. After 15 days, Vintage Air will not be responsible for missing or damaged items.

Packing List


Use of Any Other Refrigerants Will Void All Warranties of the Air Conditioning System and Components. Use of the Proper Type and

Amount of Refrigerant Is Critical to Proper System Operation. VintageAir Recommends Our Systems Be Charged By Weight With a Quality

Charging Station or Scale.

Service Info:

Safety Switches:

Important Notice—Please Read

Attention: The following system components are capped: Compressor, evaporator, condenser & drier. Caps may be under pressure with dry nitrogen. Be careful removing caps. Do not remove caps prior to installation. Removing caps prior to installation will cause components to collect moisture and lead to premature failure and reduced performance.

Evacuate the system for 35-45 minutes with system components (Drier, compressor, evaporator and condenser) at a temperature of at least 85° F. On a cool day, the components can be heated with a heat gun OR by running the engine with the heater on before evacuating. Leak check and charge to specifications.

For Maximum System Performance, Vintage Air Recommends the Following:

Heater hose may be purchased from Vintage Air (Part# 31800-VUD) or your local parts retailer. Routing and required length will vary based on installer preference.

Vintage Air Systems Are Designed to Operate With R134a Refrigerant Only! Use of Any Other Refrigerants Is a Fire Hazard and Could Damage Either Your Air Conditioning System or Your Vehicle.

Refrigerant Capacity for Vintage Air Systems:(For other systems, consult manufacturer’s guidelines)

R134a SystemCharge with 1.8 lbs. (1 lb., 12 oz.) of refrigerant.

Lubricant Capacities:New Vintage Air-supplied Sanden Compressor: No additional oil needed (Compressor is shipped with proper oil charge).All Other Compressors: Consult manufacturer (Some compressors are shipped dry and will need oil added).

Your Vintage Air system is equipped with a binary pressure safety switch. A binary switch disengages the compressor clutch in cases of extreme low pressure conditions (Refrigerant Loss) or excessively high head pressure (406 PSI) to prevent compressor damage or hose rupture. A trinary switch combines Hi/Lo pressure protection with an electric fan operation signal at 254 PSI, and should be substituted for use with electric fans. Compressor safety switches are extremely important since an A/C system relies on refrigerant to circulate lubricant.

Heater Hose (Not Included With This Kit):

To ensure a watertight seal between the passenger compartment and the vehicle exterior, for all bolts passing through the cowl and/or firewall, Vintage Air recommends coating the threads with silicone prior to installation.

Bolts Passing Through Cowl and/or Firewall:


Important Wiring Notice—Please Read

Some Vehicles May Have Had Some or All of Their Radio Interference Capacitors Removed. There Should Be a Capacitor Found At Each of the Following Locations:

1. On the positive terminal of the ignition coil.2. If there is a generator, on the armature terminal of the generator.3. If there is a generator, on the battery terminal of the voltage regulator.

Most alternators have a capacitor installed internally to eliminate what is called “whining” as the engine is revved. If whining is heard in the radio, or just to be extra cautious, a radio interference capacitor can be added to the battery terminal of the alternator.

It is also important that the battery lead is in good shape and that the ground leads are not compromised. There should be a heavy ground from the battery to the engine block, and additional grounds to the body and chassis.

If these precautions are not observed, it is possible for voltage spikes to be present on the battery leads. These spikes come from ignition systems, charging systems, and from switching some of the vehicle’s other systems on and off. Modern computer-operated equipment can be sensitive to voltage spikes on the power leads, which can cause unexpected resets, strange behavior, and/or permanent damage.

Vintage Air strives to harden our products against these types of electrical noise, but there is a point where a vehicle’s electrical system can be degraded so much that nothing can help.

Radio interference capacitors should be available at most auto and truck parts suppliers. They typically are cylindrical in shape, a little over an inch long, a little over a half inch in diameter, and they have a single lead coming from one end of the cylinder with a terminal on the end of the wire, as well as a mounting clip which is screwed into a good ground on the vehicle. The specific value of the capacitance is not too significant in comparison to ignition capacitors that are matched with the coil to reduce pitting of the points.

Care must be taken, when installing the compressor lead, not to short it to ground. The compressor lead must not be connected to a condenser fan or to any other auxiliary device. Shorting to ground or connecting to a condenser fan or any other auxiliary device may damage wiring, the compressor relay, and/or cause a malfunction.

When installing ground leads on Gen IV systems, the blower control ground and ECU ground must be connected directly to the negative battery post.

For proper system operation, the heater control valve must be connected to the ECU.

•

•

•


FIGURE 1 OEM Heater Blower

Assembly

Engine Compartment

1.

2.

3.

NOTE: Before starting the installation, check the function of the vehicle (horn, lights, etc.) for proper operation, and study the instructions, illustrations & diagrams.

Perform the Following:

Disconnect battery.

Drain and remove radiator (retain).

Remove heater blower assembly and OEM heater hoses (discard).

NOTE: To remove the OEM heater blower assembly (under hood) and the air distribution system (under dash), the factory manual recommends that the right inner fender be removed for accessibility.

Figure 1


OEM Heater Assembly& Related Ducting

OEM Defrost Duct Assembly

Control Panel

Radio

Glove BoxDoor

Assembly and Installation Refer to separate instructions included with the condenser kit to install the condenser.

Binary switch installation (Refer to condenser instructions).

1.

2.

Compressor and Brackets Refer to separate instructions included with the bracket kit to install the compressor and bracket.1.

Passenger Compartment

1.

2.

3.

4.

Perform the Following:

Remove the glove box door (retain) and glove box (discard).

Disconnect all wires and cables from control panel and radio.

Remove all hoses and ducting from defrost ducts (See Figure 2, below).

Remove OEM heater assembly.

Figure 2

Condenser


Hose Adapter

Ball Louver

49053-VUL

Dash

Passenger SideOval Defrost

Adapter49167-VCI

(2) S-clips

(2) S-clips

Driver SideRound Defrost

Adapter49168-VCI

(2) 1/4-20 Nuts w/ Star Washers

(2) 1/4” Flat Washers

Dash

OEM Defrost Ducts

Defrost Ductand Louver Installation

1.2.

3.

Install S-clips on defrost duct hose adapters, and attach to OEM defrost ducts as shown in Figure 3, below.Install center louver into dash as shown in Figure 3b, below. Use dimensions provided on Page 23. NOTE: Center louver may need to be tapped to 1/4-20 to accept studs.Install driver/passenger side louvers into dash as shown in Figure 3a, below. Use template provided on Page 22.

(2) 1/4-20 X 1 ¾”Studs

NOTE: Studs, nuts and washers are packaged in bag with heater control valve.

Figure 3

Figure 3a

Figure 3b


(2)1/4-20 X 1/2”Hex Bolts

FrontEvaporator

Bracket644080

Silicone

Back Sideof Fresh Air

Cap

Back Sideof Firewall

Cover648218

1/4-20 X 1”Bolt

Silicone

1/4” FlatWasher 1/4-20 X 1”

Bolt

1/4-20 X 1”Bolt

Drill9/32” Hole

Drill9/32” Hole

1/4” Flat Washer

1/4” Nut w/ Star Washer


OEMHole

(6) #14 X 3/4”Sheet Metal

Screws

Large Grommet33137-VUI

Grommet33135-VUI3/8”

Grommet33144-VUI

1/4” Flat WasherFresh Air

Cap

OEMHole

Fresh Air Cap& Firewall Cover Installation

1.

2.

3.

4.

5.

6.

7.

Apply a 1/4” bead of silicone around the back side of the fresh air cap as shown in Figure 4, below.

Attach fresh air cap to firewall using a 1/4-20 x 1” bolt and washer (See Figure 4, below).

Apply a 1/4” bead of silicone around the back side of the firewall cover as shown below.

Install firewall cover onto firewall using (2) 1/4-20 x 1” hex bolts, (2) flat washers and (2) 1/4” nuts with star washers in the OEM holes as shown below.

Use firewall cover as a template to drill (6) 3/16” holes in firewall, and then secure using #14 x 3/4” sheet metal screws as shown below.

Using the firewall cover as a template, drill (2) 9/32” holes in the firewall as shown below.

Install grommets as shown below.

Bracket & Evaporator Hardline Installation Figure 4

Figure 5

1.

2.

3.

On a workbench, install evaporator rear bracket using (4) 1/4-20 x 1/2” hex bolts.

Install hardlines with properly lubricated O-rings (See Figure 9, Page 12, and Figure 6, Page 10). NOTE: Wrap the #10 fitting connections with press tape (See Figure 6, Page 10).

Install evaporator front bracket onto evaporator using (2) 1/4-20 x 1/2” hex bolts, and tighten as shown in Figure 5, below.


RearEvaporator

Bracket Assembly644073

(2) 1/4-20 x 1/2”Hex Bolts

(2) 1/4-20 x 1/2”Hex Bolts

#6 Liquid Line095002

Twist WithThis

WrenchLubricate O-ring(See Figure 9,

Page 12)

Hold With This Wrench

Heater Line(Evaporator to Water Pump)

095004

ECU Module

#10 O-ring

NOTE: After Installing#10 Suction Line, Wrap All Exposed Metal(Fittings & Tube)With Supplied Press Tape.

#10 O-ring

#10 SuctionLine

095003

#6 Liquid Line095002

Press Tape

Heater Line(Evaporator to Intake)

095005

#6 O-ring

Bracket & Evaporator Hardline Installation (Cont.)

Figure 6


Inner Cowl

Drill (2)3/16” Holes

(2)#14 x 3/4”Sheet Metal

Screws

1/4-20 x 1”Hex Bolt

1/4-20 x 1”Hex Bolt

Flat Washer

1/4”Flat

Washer


View FromPassenger Side,

Inside of Cab

Evaporator Installation

1.

2.

3.

Lift evaporator unit up under the dashboard, and secure loosely to the firewall using (2) 1/4-20 x 1” hex bolts, (2) flat washers and (2) 1/4” nuts with star washers (See Figure 7, below). NOTE: To ensure proper drainage, it is very important that the evaporator is level, both left-to-right and fore-aft. Check for level on the flat portions of the case around the drain, block the unit up, and then drill holes for front bracket screws.

Secure the front evaporator mounting bracket to the cowl using (2) #14 x 3/4” hex sheet metal screws (See Figure 7a, below).

Verify that the evaporator unit is level and square to the dash, and then tighten all mounting bolts. NOTE: Tighten the bolt on firewall first, and then the front mounting bracket.

Figure 7

Figure 7a


EvaporatorCase1”

DrainHose

1”

Drain Hose Installation 1.

2.

3.

Locate evaporator drain on bottom of evaporator case.In line with drain, lightly make a mark on thefirewall. Measure 1” down and drill a 5/8” hole through the firewall.Install drain hose to bottom of evaporator unit and route through firewall. Install 1/2” 90° drain elbow onto drain hose.

Figure 8

A/C Hose Installation Standard Hose Kit:

Modified A/C Hose Kit:

Locate the #8 compressor A/C hose. Lubricate (2) #8 O-rings (See Figure 9, above) and connect the 135° female fitting with 134a service port to the #8 discharge port on the compressor. Route the straight female fitting to the #8 condenser hardline coming through the core support (See Figure 11, Page 14). Tighten each fitting connection as shown. Locate the #10 compressor A/C hose. Lubricate (2) #10 O-rings (See Figure 9, above) and connect the #10 135° female fitting with 134a service port to the #10 suction port on the compressor. Route the 90° female fitting to the #10 evaporator (See Figure 10, Page 13, and Figure 11, Page 14). Tighten each fitting connection as shown. Locate the #6 evaporator A/C hose. Lubricate (2) #6 O-rings (See Figure 9, above) and connect the straight female fitting to the #6 condenser hardline coming through the core support. Route the 90° female fitting to the #6 evaporator (See Figure 10, Page 13, and Figure 11, Page 14). Tighten each fitting connection as shown.

1.

2.

3.

1.

Figure 9

O-ring Installs Over Male Insert to Swaged Lip

O-ring#6 O-ring

#8 O-ring #10 O-ring

O-ring

Supplied Oil for O-rings

Male Insert

Female Nut

Hold With This Wrench

Twist With This Wrench

Lubricating O-rings For a proper seal of fittings: Install supplied O-rings as shown, and lubricate with supplied oil.

NOTE: Standard torque specifications:#6: 11 to 13 ft-lb.#8: 15 to 20 ft-lb.

#10: 21 to 27 ft-lb.

Refer to separate instructions included with modified hose kit.


#10 SuctionLine

O-rings

HeaterHose NOTE: Flow Direction Follows

Molded Arrow on Valve.

LiquidLine

FROM HTR CNTRL VLVTO EVAPORATOR

FROM EVAPORATORTO WATER PUMP

FROM INTAKEMANIFOLD

Heater Hose and Heater Control Valve Installation

Route heater hose from water pump to the heater line coming through the firewall as shown in Figure 10, below. Secure using hose clamps. NOTE: A small amount of silicone spray will ease heater hose installation.Route heater hose from the intake to the heater line coming through the firewall as shown below. NOTE: Install heater control valve in line with intake manifold (pressure side) heater hose, and secure using hose clamps as shown. Also note proper flow direction.Hose should protrude through the firewall cover slightly to close the gap between the aluminum line and the firewall cover. Seal any remaining gap with RTV silicone.

1.

2.

3.

Figure 10


FRO

M IN

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MA

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Fig

ure

11

#6

Hos

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6002

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#8

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ose

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rier

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ter

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FRO

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R

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ATER

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Saf

ety

Sw

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ollo

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Glove Box496067

Final Steps 1.2.

3.4.

5.6.7.8.

9.10.11.12.13.

Install duct hoses as shown in Figure 13, Page 16.Route A/C wires (12 volt/ground/binary switch/heater valve) through 3/8” grommet as shown in Figure 12, below.Install control panel assembly.Plug the wiring harnesses into the ECU module on the sub case as shown in Figure 13, Page 16 (Wire according to wiring diagram on Pages 17 and 18).Install new glove box using OEM screws (See Figure 12a, below).Install glove box door.Reinstall all previously removed items, including inner fender.Fill radiator with at least a 50/50 mixture of approved antifreeze and distilled water. It is the owner's responsibility to keep the freeze protection at the proper level for the climate in which the vehicle is operated. Failure to follow antifreeze recommendations will cause heater core to corrode prematurely and possibly burst in A/C mode and/or freezing weather, voiding your warranty.Double check all fittings, brackets and belts for tightness.Vintage Air recommends that all A/C systems be serviced by a certified automotive air conditioning technician. Evacuate the system for a minimum of 45 minutes prior to charging, and perform a leak check prior to servicing. Charge the system to the capacities stated on Page 4 of this instruction manual. See Operation of Controls procedures on Page 19.

Figure 12a

Figure 12

Grommet33144-VUI

Wiring Harness(12 Volt/Ground/Binary Switch)

Wiring Harness(Heater Control Valve)


PlugFrom

ControlWiring

Harness232002-VUA

PlugFromWiring

Harness232001-VUR

Passenger SideLouver

2 ½” X 36”

Driver SideLouver

2 ½” X 48”

CenterLouver

2 ½” X 18”

Passenger SideDefrost Duct

2” X 12”

Driver SideDefrost Duct

2” X 24”

Control Panel and Duct Hose Routing

Figure 13


WHT/GRN

WHT/YELWHT/RED

RED

WHTBACKLIGHT NEG

FAN WIPER

MODE WIPER

TEMP WIPER

5V-SW

GND

BACKLIGHT POS

AC ANNUNCIATOR

PRE-WIRED

GEN IV WIRING DIAGRAMREV D, 5/6/2014

GEN IV ECU

PROGRAM

Wiring Diagram

TEMP

MODE

FAN

A/C(IF USED)

232007-VUR

232002-VUA

** CIRCUITBREAKER30 AMP

*** WIDE OPENTHROTTLESWITCH

(OPTIONAL)

* DASH LAMP(IF USED)

Dash Lamp Is Used Only With Type 232007-VUR Harness.Warning: Always Mount Circuit Breaker As Close to the Battery As Possible. (NOTE: Wire BetweenBattery and Circuit Breaker Is Unprotected and Should Be Carefully Routed to Avoid a ShortCircuit).Wide Open Throttle Switch Contacts Close Only at Full Throttle, Which Disables A/C Compressor.

JF8

BLK

ORA

TAN

VIEWED FROM WIRE SIDE

••

•

HEATERCONTROL VALVE


RED

CIRCUIT BREAKER30 AMP

+

+

-

BLACK

REDWHITE

RED

CHASSIS GROUND

A/CCOMPRESSOR

RELAY

Ignition Switch:

Dash Light:

NOTE: MOUNT RELAYIN DESIRED LOCATION

UNDER DASH

GREEN

FIREWALL

BLUE

BLUE

RED &

WHITE

VIOLET

(IGNITION HOTTERMINAL)

IGNITION SWITCH

DASH BACK LIGHT+0-12vTAN

GRAY

BLUE

WHITE

WHITE

REDRED

WHITE

COMPRESSOR

BATTERY

NOTE: CONNECT WHITEWIRES DIRECTLY TO

(-) BATTERY TERMINAL

BATRUN

12V

RED GREEN

RED

RED

BLUE

LATCH

BLACK

BINARYSAFETYSWITCH

YELLOW

ORANGE

WIRING HARNESS

Violet 12V Ign Switch Source (Key On Accessory) Position Must Be Switched.

Tan Wire Used Only With Vintage Air Supplied Control Panel With LED Back Light.

Binary: Connect As Shown (Typical Compressor Wiring). Be Sure Compressor Body Is Grounded.

Trinary Switch: Connect According To Trinary Switch Wiring Diagram.

Install With Servo Motor Facing Down, As Shown. Note Flow Direction Arrow Molded Into Valve Body, And Install Accordingly.

White Must Run To (-) Battery. Red May Run To (+) Battery Or Starter. Mount Circuit Breaker As Close to Battery As Possible.

Heater Control Valve:

Binary/Trinary & Compressor:

Circuit Breaker/Battery:

CONTROL WIRING HARNESS

NOTE: YELLOW & ORANGE

COMING FROM HARNESS ARE NOT

USED.

WIRING HARNESS

GRAY WIRE IS USED FOR PROGRAMING CONTROLS

IF APPLICABLE

WIRING HARNESS

Gen IV Wiring Connection Instruction

HEATERCONTROL VALVE

WARNING: ALWAYS MOUNT CIRCUIT BREAKER

AS CLOSE TO THE BATTERY AS POSSIBLE. (NOTE: WIRE BETWEEN BATTERY AND CIRCUIT BREAKER IS UNPROTECTED

AND SHOULD BE CAREFULLY ROUTED TO AVOID A SHORT CIRCUIT).

NOTE: HEATER CONTROL VALVE CONNECTION AND CHASSIS GROUND MAY BE LOCATED ON EITHER SIDE OF THE FIREWALL. ENSURECONNECTOR IS LATCHED

FIRMLY.


Operation of Controls

Adjust to desiredspeed.

Blower SpeedAdjust to desired

speed.

Adjust to desiredmode position (DASH position recommended).

Adjust to desiredspeed.

Adjust to DEFROST position for maximum defrost, or between FLOOR and DEFROST positions for a bi-level

blend (Compressor is automatically engaged).

Adjust to desired temperature.

For A/C operation, adjust tocoldest position to engage

compressor (Adjust between HOT and COLD to reachdesired temperature).

A/C Operation

Heat Operation

Defrost/De-fog Operation

On Gen IV systems with three lever/knob controls, the temperature control toggles between heat and A/C operations. To activate A/C, move the temperature lever/knob all the way to cold and then back it off to the desired vent temperature. For heat operation, move the temperature lever/knob all the way to hot and then adjust to the desired vent temperature. The blower will momentarily change speed, each time you toggle between operations, to indicate the change. NOTE: For proper control panel function, refer to control panel instructions for calibration procedure.

Blower Speed

Blower Speed

This lever/knob controlsblower speed, from

OFF to HI.

This lever/knob controls the mode positions,from DASH to FLOORto DEFROST, with a blend in between.

This lever/knob controlsthe temperature,

from HOT to COLD.

Blower Speed

Mode Control

Temperature Control

Blower Speed

TemperatureControl

ModeControl

Temperature Control

Temperature Control

Temperature Control

Mode Control

Mode Control

Mode Control

For maximum heating, adjust to hottest position (Adjust between HOT and COLD to reach desired temperature).Adjust to desired

mode position(FLOOR position recommended).

HEAT

DEF

AIR FAN

(DASH) (FLOOR) (DEFROST)

HEAT

DEF

AIR FAN

HEAT

DEF

AIR FAN

HEAT

DEF

AIR FAN


Sym

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1a.

No o

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ions

work

.

Chec

k fo

r dam

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pin

s or

wires

in c

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lug.

Ver

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that

all

pin

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sert

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plu

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Ensu

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hat

no

pin

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dam

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in E

CU

.

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Unplu

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BSC c

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ECU

. If

blo

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uts

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ECU

is

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ired

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.

Be

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it

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ECU

.

Unplu

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BSC c

ontr

ol

connec

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from

ECU

. If

blo

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st

ays

runnin

g,

BSC is

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er

impro

per

ly w

ired

or

dam

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.

Chec

k to

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re t

hat

no B

SC w

irin

g is

dam

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or

short

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The

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the

blo

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ide

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e w

idth

modula

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witch

ing.

The

posi

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will

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ays

be

hot.

If th

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side

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the

blo

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the

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(All

oth

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work

).

2.

Sys

tem

is

not

char

ged

.Sys

tem

must

be

char

ged

for

com

pre

ssor

to e

ngag

e.Char

ge

syst

em o

r byp

ass

pre

ssure

sw

itch

.

Dan

ger:

Never

byp

ass

sa

fety

sw

itch

wit

h

en

gin

e r

un

nin

g.

Seri

ou

s in

jury

can

resu

lt.

Sys

tem

is

char

ged

.

1b

.

Tro

ub

lesh

oo

tin

g G

uid

e

Chec

k fo

r fa

ulty

A/C

pote

ntiom

eter

or

asso

ciat

ed

wirin

g (

Not

applic

able

to 3

-pot

contr

ols

).

Chec

k fo

r dis

connec

ted o

r fa

ulty

ther

mis

tor.

Chec

k co

ntinuity

to g

round o

n w

hite

contr

ol hea

d w

ire.

Chec

k fo

r 5V o

n r

ed c

ontr

ol hea

d w

ire.

Chec

k 2-p

in c

onnec

tor

at E

CU

housi

ng.

To c

hec

k fo

r pro

per

pot

funct

ion,

chec

k vo

ltag

e at

w

hite/

blu

e w

ire.

Voltag

e sh

ould

be

bet

wee

n 0

V a

nd

5V,

and w

ill v

ary

with p

ot

leve

r posi

tion.

Dis

connec

ted o

r fa

ulty

ther

mis

tor

will

cau

se

com

pre

ssor

to b

e dis

able

d.

Red

wire

at A

/C p

ot

should

hav

e ap

pro

xim

atel

y 5V

with ignitio

n o

n.

White

wire

will

hav

e co

ntinuity

to

chas

sis

gro

und.

White/

Blu

e w

ire

should

var

y bet

wee

n 0

V a

nd 5

V w

hen

le

ver

is m

oved

up o

r dow

n.

3. Com

pre

ssor

will

not

turn

off

(A

ll oth

er funct

ions

work

).

Chec

k fo

r fa

ulty

A/C

pote

ntiom

eter

or

asso

ciat

ed

wirin

g.

Chec

k fo

r fa

ulty

A/C

rel

ay.

Rep

air

or

repla

ce p

ot/

contr

ol w

irin

g.

Rep

lace

rel

ay.

See

blo

wer

sw

itch

chec

k pro

cedure

.


Sym

pto

m

C

on

dit

ion

Ch

eck

s

Act

ion

s

N

ote

s

Sys

tem

will

not

turn

on,

or

runs

inte

rmitte

ntly.

4.

Work

s w

hen

engin

e is

not

runnin

g;

shuts

off w

hen

en

gin

e is

sta

rted

(T

ypic

ally

ear

ly G

en I

V,

but

poss

ible

on a

ll ve

rsio

ns)

.

Nois

e in

terf

eren

ce f

rom

either

ig

nitio

n o

r al

tern

ator.

Inst

all ca

pac

itors

on ignitio

n c

oil

and a

lter

nat

or. E

nsu

re

good g

round a

t al

l poin

ts.

Rel

oca

te c

oil

and a

ssoci

ated

w

irin

g a

way

fro

m E

CU

and E

CU

wirin

g.

Chec

k fo

r burn

edor

loose

plu

g w

ires

.

Ver

ify

connec

tions

on p

ow

er

lead

, ig

nitio

n lea

d,

and b

oth

white

gro

und w

ires

.

Ver

ify

pro

per

met

er f

unct

ion b

y ch

ecki

ng t

he

conditio

n o

f a

know

n g

ood b

atte

ry.

Ignitio

n n

ois

e (r

adia

ted o

rco

nduct

ed)

will

cau

se t

he

syst

em t

o s

hut

dow

n d

ue

tohig

h v

oltag

e sp

ikes

. If

this

is s

usp

ecte

d,

chec

k w

ith a

qual

ity

osc

illosc

ope.

Spik

esgre

ater

than

16V w

ill s

hut

dow

n t

he

ECU

. In

stal

l a

radio

cap

acitor

at t

he

posi

tive

post

of th

e ig

nitio

nco

il (S

ee r

adio

cap

acitor

inst

alla

tion b

ulle

tin).

A

faulty

alte

rnat

or

or

worn

out

bat

tery

can

als

o r

esult

in t

his

conditio

n.

Will

not

turn

on u

nder

an

y co

nditio

ns.

Ver

ify

bat

tery

voltag

e is

gre

ater

than

10 v

olts

and les

sth

an 1

6.

Loss

of m

ode

door

funct

ion.

No m

ode

chan

ge

at a

ll.Chec

k fo

r dam

aged

mode

switch

or

pote

ntiom

eter

and

asso

ciat

ed w

irin

g.

Part

ial fu

nct

ion o

f m

ode

doors

.

Typic

ally

cau

sed b

y ev

apora

tor

housi

ng

inst

alle

d in a

bin

d in t

he

vehic

le.

Be

sure

all

mounting loca

tions

line

up

and d

on’t h

ave

to b

e fo

rced

in

to p

osi

tion.

Blo

wer

turn

s on

and o

ff r

apid

ly.

6.

Bat

tery

voltag

e is

at

leas

t 12V.

Chec

k fo

r at

lea

st 1

2V a

t ci

rcuit b

reak

er.

Ensu

re a

ll sy

stem

gro

unds

and p

ow

er c

onnec

tions

are

clea

n a

nd t

ight.

Bat

tery

voltag

e is

les

s th

an 1

2V.

5.

Tro

ub

lesh

oo

tin

g G

uid

e (

Co

nt.

)

Chec

k fo

r fa

ulty

bat

tery

or

alte

rnat

or.

Char

ge

bat

tery

.

Sys

tem

shuts

off b

low

er a

t 10V.

Poor

connec

tions

or

wea

k bat

tery

can

cau

se

shutd

ow

n a

t up t

o 1

1V.

7. When

ignitio

n is

turn

ed o

n,

blo

wer

m

om

enta

rily

co

mes

on,

then

sh

uts

off.

This

occ

urs

with t

he

blo

wer

sw

itch

in

the

OFF

posi

tion.

This

is

an indic

ator

that

the

syst

em h

as b

een r

eset

. Be

sure

the

red p

ow

er w

ire

is o

nth

e bat

tery

post

, an

d n

ot

on a

sw

itch

ed s

ourc

e. A

lso,

if

the

syst

em is

pulle

d b

elow

7V f

or

even

a s

plit

sec

ond,

the

syst

em w

ill r

eset

.

Run r

ed p

ow

er w

ire

direc

tly

to b

atte

ry.

Chec

k fo

r posi

tive

pow

er a

t hea

ter

valv

e gre

en w

ire

and

blo

wer

red

wire.

Chec

k fo

r gro

und o

n c

ontr

ol hea

d w

hite

wire.

Chec

k fo

r obst

ruct

ed o

r bin

din

g m

ode

doors

.

Chec

k fo

r dam

aged

ste

pper

m

oto

r or

wirin

g.

Err

atic

funct

ions

of

blo

wer

, m

ode,

te

mp,

etc.

Chec

k fo

r dam

aged

sw

itch

or

pot

and a

ssoci

ated

wirin

g.

Rep

air

or

repla

ce.

8.


TEMPLATE FOR DRIVER SIDE

TEMPLATE FOR PASSENGER SIDE

END OF DASHDRIVER SIDE

CUT 2 ½”

DIAMETERHOLE

CUT 2 ½”

DIAMETERHOLE

BOTTOM EDGEOF DASH FACE

BOTTOM EDGEOF DASH FACE

END OF DASHPASSENGER SIDE

Driver/Passenger Side Louver Template


5 ½”

1 �¼”

Center Louver Dimensions

Center Louver Dimensions

Top of Radio Opening

1 1/16”


Evaporator Kit (751170)

1

Accessory Kit791170

2

No. Qty. Part No. Description

NOTE: Images may not depict actual parts and quantities. Refer to packing list for actual parts and quantities.

Gen IV 3-Vent Evaporator Sub Case

w/ 204 ECU744005

Gen IV 3-Vent Evaporator Sub Case w/ 204 ECUAccessory Kit 67-72 Chevy Pickup without A/C

1.2.

11

744005791170

Packing List

Checked By:Packed By:

Date:

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1967-72 Chevy Pickup - Speedway MotorsUse dimensions provided on Page 23. NOTE: Center louver may...

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