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#4505889 - 09/02/17 11:08 PM Anti-Theft....now no air conditioning?
lukejo Offline


Registered: 09/21/11
Posts: 404
Loc: 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?

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#4505962 - 09/03/17 04:54 AM Re: Anti-Theft....now no air conditioning? [Re: lukejo]
WyrTwister Offline


Registered: 01/13/13
Posts: 1503
Loc: Texas
Is the compressor clutch working ?
_________________________
Wyr
God bless

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#4506022 - 09/03/17 08:19 AM Re: Anti-Theft....now no air conditioning? [Re: lukejo]
eljefino Online   content


Registered: 06/15/03
Posts: 32631
Loc: 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?

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#4506090 - 09/03/17 09:37 AM Re: Anti-Theft....now no air conditioning? [Re: lukejo]
WyrTwister Offline


Registered: 01/13/13
Posts: 1503
Loc: 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 .
_________________________
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#4506130 - 09/03/17 10:18 AM Re: Anti-Theft....now no air conditioning? [Re: lukejo]
GMBoy Offline


Registered: 11/22/04
Posts: 7702
Loc: 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.


Edited by GMBoy (09/03/17 10:20 AM)

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#4506837 - 09/03/17 10:50 PM Re: Anti-Theft....now no air conditioning? [Re: GMBoy]
lukejo Offline


Registered: 09/21/11
Posts: 404
Loc: 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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