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Auto Climate Stuck In Defrost Mode


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#1 862001

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Posted 29 November 2007 - 10:55 AM

Hello, I have a 2004 Suburban LT 2500 with the auto climate control. This all seemes to have started after I had a loose battery connection. The climate control seems to be in a default mode and is stuck on defrost, the fan speed and temp does work correctly, I just cannot get air to come out of vents or the floor settings.
I also noticed the AC comppresor clutch is not engaging.
I did some resaerch and found this sevice bulletin, 04-01-38-008 dated 6-17-2004.
It know it may be just a coincidence regarding the battery connection, but it did work fine untill then.
I also switched out the AC relay under the hood and it did not help.

Any help on this will be greatly appreciated.

John

#2 862001

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Posted 29 November 2007 - 04:54 PM

ttt

#3 84MCSS

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Posted 29 November 2007 - 11:39 PM

disconnect battery again, reconnect turn key to on position, wait 30 seconds. this happened to mine when the battery went dead. a/c blew cold on drivers side hot on pass. side. after the 2nd reconnect of battery it was fine. WHY???? don't know :sigh:

#4 862001

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Posted 30 November 2007 - 02:21 PM

Thank you I will try that.
I also came acroos this service bullitin #04-01-38-008 dated 6-17-04. Service buletin states wireing harness behind guages is to short and causes HVAC to go into a default mode (defrost only).
I am also going to investigate this bulletin if the battery trick does not work.

#5 862001

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Posted 30 November 2007 - 04:09 PM

It's fixed!!!
If anyone cares to know, I fixed this problem by locating and unplugging the blend door actuator.
The actuator motor is located behind the lower center dash, over the tranny hump, and accesed from the drivers side.




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