Mechanics

A/C COOLING

2000 Cadillac Escalade

Air Conditioning problem
2000 Cadillac Escalade

The air conditioning for the driver's cabin does not get cool, yet the a/c for the backseat and rear cabin does get cool.
Avatar
Grosas
June 22, 2010.




Sounds like a possible temp door actuator fault, or HVAC control module. Does it change temperature at all, or does it seem stuck in one position?

Factoryjack
Jun 22, 2010.
The temperature does not change; it never cools in the front, only in the backseat
AD

Tiny
Grosas
Jun 22, 2010.
If you have a voltmeter, and know how to use it, you can reference the following fault chart.
Temperature Actuator Inoperative (FRONT)
Step

Action
Value(s)
Yes
No

1
Has the HVAC Air Delivery System Check been performed?
--
Go to Step 2
Go to HVAC Air Delivery System Check

2
Place the ignition switch in the RUN position.
Disconnect the connector at the front temperature door motor.
Connect DMM (volts) between the front temperature door motor connector, cavity 10, and ground.
Is battery voltage present?
--
Go to Step 4
Go to Step 3

3
Locate and repair the open in CKT 141 (BRN) between the IP fuse block and the front mode door motor. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to HVAC Air Delivery System Check
--

4
Connect a DMM (continuity) between the front temperature door motor connector, cavity 7, and ground.

Is continuity present?
--
Go to Step 6
Go to Step 5

5
Locate and repair the open in CKT 150 (BLK) between the front temperature door motor and splice S244. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to HVAC Air Delivery System Check
--

6
Place the ignition switch in the RUN position.
Place the blower switch on the HVAC control module in the LO position.
Make sure that the front blower motor is operating.
Connect a DMM (volts) from the front temperature door motor connector, cavity 8, to ground.
Adjust the position of the temperature control dial while observing the DMM response.
Is the DMM response a smooth, variable voltage?
--
Go to Step 9
Go to Step 7

7
Disconnect connector C3 at the HVAC control module.
Connect a DMM (volts) between pin 8 of the HVAC control module, and ground.
Adjust the position of the temperature control dial while observing the DMM response.
Is the DMM response a smooth, variable voltage?
--
Go to Step 8
Go to Step 10

8
Locate and repair the open or cause of resistance in CKT 733 (LT BLU) between the HVAC control module and the front temperature door motor. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to HVAC Air Delivery System Check
--

9
Replace the front temperature door motor. Refer to Temperature Actuator Replacement .

Is the repair complete?
--
Go to HVAC Air Delivery System Check
--

10
Replace the HVAC control module. Refer to Control Assembly Replacement .

Is the repair complete?
--
Go to HVAC Air Delivery System Check

I am not sure if the temperature actuator can be accessed in situ, for replacement it shows partial removal of the instrument panel. Here is a view.


http://www.2carpros.com/forum/automotive_pictures/309872_372168_1.jpg



(1) Blower Resistor
(2) Blower Motor
(3) Blower Motor Connectors
(4) C230
(5) C203
(6) C204
(7) Temperature Door Motor
(8) HVAC Plenium
(9) Mode Door Motor
(10) HVAC Wiring Harness
(11) Blower Motor Relay, High

The HVAC control module is the same as the control panel.

Factoryjack
Jun 22, 2010.

AD