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2004 DeVille Rear A/C Information

I have an up coming job on a rear a/c system reported blowing hot air. I'm looking for any information regarding the rear A/C's running operation, systems, schematics, parts...any tutorials or advise anyone may have, or that maybe here on the forum.

Thanking all in advance!

arcmech.

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If the air outlet from the front ducts is cool, the problem is most likely a bad actuator in the rear duct. The system does not have a rear evaporator like a Suburban. It is just an actuator in the rear duct.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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If the air outlet from the front ducts is cool, the problem is most likely a bad actuator in the rear duct. The system does not have a rear evaporator like a Suburban. It is just an actuator in the rear duct.

Yes, the air is cold coming from the front ducts....

I think the "auxiliary actuator" is located up on or near the (main) blower motor. If it is not in the commanded position it should set a B0429 code.

I'll check and look for the actuator up by the front blower motor?

There are no DTC's set but I'll check the Caddy's on-board read outs.

Thank's for the input!

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2004 DeVille Rear A/C

Pulled the glove box and access panel underneath covering the blower motor looking for the rear a/c actuator. Looking at the blower motor and ducting system through the glove box opening I see what looks to be 2 actuators, one is mounted on the right side of the blower motor on the duct / housing and has 3 leads,

A Red and Black lead both 10 ga. in size,

and a 16 ga. Gray lead with a Black line.

The second actuator is mounted on the ducting to the left of the blower motor nearer the center of the dash and has 4 leads all 16 ga. in size. Their color coding are,

Orange

Brown

Gray w/ Black Line

White w/ Black Line

Any info as to which is the correct actuator for the rear A/C ?

Thank's everyone!

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2004 DeVille Rear A/C

Pulled the glove box and access panel underneath covering the blower motor looking for the rear a/c actuator. Looking at the blower motor and ducting system through the glove box opening I see what looks to be 2 actuators, one is mounted on the right side of the blower motor on the duct / housing and has 3 leads,

A Red and Black lead both 10 ga. in size,

and a 16 ga. Gray lead with a Black line.

The second actuator is mounted on the ducting to the left of the blower motor nearer the center of the dash and has 4 leads all 16 ga. in size. Their color coding are,

Orange

Brown

Gray w/ Black Line

White w/ Black Line

Any info as to which is the correct actuator for the rear A/C ?

Thank's everyone!

An update to my above post...

I checked the schematics from a "Haynes" manual which showed wiring color codes for the second actuator mentioned above. I borrowed an actuator from a second Caddy, tried it on the problem one and got the rear A/C to work so this was /is the problem and also the correct actuator location.

Thank's for the info Ranger and KHE!

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