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Anti-Theft....now no air conditioning? #4505889
09/02/17 10:08 PM
09/02/17 10:08 PM
Joined: Sep 2011
Posts: 423
IL
lukejo Offline OP
lukejo  Offline OP
Joined: Sep 2011
Posts: 423
IL
2009 Silverado engine immobilizer tripped on accident....battery drained and had to jump start...now everything is fine except the air conditioning does not cool. Fan and controls work and sounds like compressor kicks on, but only blows hot air. Never a problem before. No error or problem lights on dash.
Anyone heard of this or ideas?

Re: Anti-Theft....now no air conditioning? [Re: lukejo] #4505962
09/03/17 03:54 AM
09/03/17 03:54 AM
Joined: Jan 2013
Posts: 2,099
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 2,099
Texas
Is the compressor clutch working ?


Wyr
God bless
Re: Anti-Theft....now no air conditioning? [Re: lukejo] #4506022
09/03/17 07:19 AM
09/03/17 07:19 AM
Joined: Jun 2003
Posts: 33,568
ME
eljefino Online content
eljefino  Online Content
Joined: Jun 2003
Posts: 33,568
ME
That is weird. I've heard of "retraining" blend doors but it should at least blow cold. Maybe pull the battery terminal for a few minutes for a "clean" reboot?

Re: Anti-Theft....now no air conditioning? [Re: lukejo] #4506090
09/03/17 08:37 AM
09/03/17 08:37 AM
Joined: Jan 2013
Posts: 2,099
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 2,099
Texas
Not sure , but I think some cars may have flow in both the heater core & evaporator coil . With a blend door controling how the air is mixed ? Or some variation of that .

If , for what ever reason , the blend door is stuck in the full heat position , you couls have the " cols side " blocked .

That is why I asked if the suction / low pressure line was getting cold .


Wyr
God bless
Re: Anti-Theft....now no air conditioning? [Re: lukejo] #4506130
09/03/17 09:18 AM
09/03/17 09:18 AM
Joined: Nov 2004
Posts: 7,805
Texas
GMBoy Online content
GMBoy  Online Content
Joined: Nov 2004
Posts: 7,805
Texas
When there is a fault with the blend door actuators, the default mode is HEAT. Whatever happened with your battery must have glitched the system. I would recalibrate the actuators and here is how (if you have the auto climate system):

Do the w/o scan tool procedure.


----------

Actuator Recalibration
When replacing an HVAC control module or actuator it will be necessary to allow the HVAC control module to perform an actuator calibration process. When installing these components be sure to perform one of the following:

Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

Preferred Method (w/Scan Tool)
Clear all DTCs.
Place the ignition switch in the OFF position.
Install the HVAC control module or HVAC actuator.
Connect all previously disconnected components.
Start the vehicle.
With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
Verify that no DTCs have set as current DTCs.

Alternate Method (w/o Scan Tool)
Clear all DTCs.
Place the ignition switch to the OFF position.
Install the HVAC control module or HVAC actuator.
Connect all previously disconnected components.
Remove the HVAC/ECAS fuse for a minimum of 10 seconds.
Install the HVAC/ECAS fuse.
Start the vehicle.
Wait 40 seconds for the HVAC control module to self-calibrate.
Verify that no DTCs have set as current DTCs.

Last edited by GMBoy; 09/03/17 09:20 AM.
Re: Anti-Theft....now no air conditioning? [Re: GMBoy] #4506837
09/03/17 09:50 PM
09/03/17 09:50 PM
Joined: Sep 2011
Posts: 423
IL
lukejo Offline OP
lukejo  Offline OP
Joined: Sep 2011
Posts: 423
IL
Originally Posted By: GMBoy
When there is a fault with the blend door actuators, the default mode is HEAT. Whatever happened with your battery must have glitched the system. I would recalibrate the actuators and here is how (if you have the auto climate system):

Do the w/o scan tool procedure.


----------

Actuator Recalibration
When replacing an HVAC control module or actuator it will be necessary to allow the HVAC control module to perform an actuator calibration process. When installing these components be sure to perform one of the following:

Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

Preferred Method (w/Scan Tool)
Clear all DTCs.
Place the ignition switch in the OFF position.
Install the HVAC control module or HVAC actuator.
Connect all previously disconnected components.
Start the vehicle.
With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
Verify that no DTCs have set as current DTCs.

Alternate Method (w/o Scan Tool)
Clear all DTCs.
Place the ignition switch to the OFF position.
Install the HVAC control module or HVAC actuator.
Connect all previously disconnected components.
Remove the HVAC/ECAS fuse for a minimum of 10 seconds.
Install the HVAC/ECAS fuse.
Start the vehicle.
Wait 40 seconds for the HVAC control module to self-calibrate.
Verify that no DTCs have set as current DTCs.

Thanks so much! We'll give it a try!


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