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10985 Instructions 10985 Instructions


THIS UNIT FITS ONLY:

190D 2.5
88 - 89
190E 2.3
88 - 93
190E 2.6
88 - 93



It is strongly recommended the Auxiliary Pump is changed
prior to installing Push Button Control Unit.


Perform steps 1 - 3 prior to installation.


1.

Turn off ignition and disconnect (L) Left and (R) Right connectors from climate control unit.


2.
Isolate Auxiliary Pump. Current draw = less than 1.3 amps.
IF NOT, REPLACE AUXILIARY
PUMP OR WARRANTY IS VOID.























THREE YEAR WARRANTY





Climate Control

Revised 11/15/00

#10985
INSTALLATION NOTES




ORIGINAL UNIT PROBLEM


Symptoms
Test/Suspect
Problems


Solution

No flaps, heat, fan.

Check fuse.


Replace fuse.

No heat.

Auxiliary pump test. Isolate Pump.
Current draw = less than 1.3 amps.

Replace Auxiliary pump, Climate Control
Unit.


NEW UNIT PROBLEMS


Symptom

Test/Suspect Problem


Solution

Interior Temperature sensor.
(+) L pin 9 (-) R pin 12 = 9.5k ohms @ 77
°

Fahrenheit.

Replace sensor.

Coolant Temperature sensor.
(+) L pin 3 (-) R pin 12 = .9 - 1.8k ohms @ 140
°

Fahrenheit..

Replace sensor.

Ambient temperature sensor.
(+) L pin 10 (-) R pin 12 = 2.4k ohms @ 77
°

Fahrenheit.

Replace sensor.

A.C. compressor only works
in defrost.

Evaporator temperature sensor.

(+) L pin 7 (-) R pin 12 = 20k ohms @ 77
°

Fahrenheit.

Replace sensor.


No A.C., no blower, no blend
air flaps.

Externally connected circuit has a short circuit.
(Auxiliary pump, A.C. Compressor Cutout control unit,
switch over valves)

Check all external circuits for short circuit .

Cold at center vents, heat at
sides vents.

Feedback potentiometer.

See test and adjustment, page 3.

Feedback potentiometer.


See test and adjustment, page 3.

Heat at all times.

No vacuum to switch over valves.


Repair as necessary.

Feedback potentiometer.

See test and adjustment, page 3.

No A.C. control.

Defective A.C. Cutout Control Unit.

Replace A.C. Cutout Control Unit.

When unit is off, fan stays
on, or fan cycles on and off.

Short circuit in sensor(s) and/or feedback potentiometer.
(+) R pin 9 (-) R pin 12 = pulsating voltage.
Interior Temperature sensor
= 5 pulses
Ambient Temperature sensor = 10 pulses
Feedback Potentiometer
= 15 pulses
Evap Temperature sensor

= 20 pulses
Coolant Temperature Sensor = 25 pulses


Replace sensor/switch.











Climate Control
Revised 11/15/00
#10985
To Test:

1.

Remove Glove Box Liner.

2.

Locate Pig Tail from feedback potentiometer. Without separating the connector, use a
voltmeter and insert the black lead into the pin with brown wire; insert the red lead into
the pin with the green/red wire or blue wire. The pins with red wire are not used.

3.

Run engine at idle speed with Climate Control Unit connected.


4.

Depress this button on switch unit, engage temperature wheel at MIN and wait for
approximately 60 seconds. Voltage should be between 2.4 and 2.7 Volts

5.

Engage temperature wheel at MAX and wait for approximately 60 seconds, voltage
should be between .3 and 1.2 Volts
NOTE: If voltage does not change, check electrical connections, as well as vacuum supply to switch
over valves.

The voltage tolerance in steps 3 & 4 must be adhered to since the control functions of the
compressor and the closing of the heater valve depend of these values.

If the voltage is out of tolerance perform adjustment.

Feedback potentiometer adjustment without removing dash.

Allow 1-2 hours for this procedure.

A.
Remove antenna switch next to rear defrost, so adjusting lever can be seen. Shine
a light through this hole. Look 45
° towards right front wheel.
B.
Remove glove box.
C.
Depress the box button(as shown above).
D.
Set temp wheel at MIN, using a 5.5mm socket, and long extension and swivel
adapter, turn adjustment screw until 2.5 volts is measured on the voltmeter.(see
Fig. 1 )(clockwise lowers voltage, counter clockwise increases voltage)
E.
Engage temperature wheel at MAX and wait for approximately 60 seconds,
voltage should be between .3 Volts - 1.2 Volts


NOTE: Versions with dash insulation, can be difficult to see screw.


Fig. 1




















Climate Control
Revised11/15/00
#10985