Ac problems

[Keonsr10]

I have a 2008 Tahoe Ltz one day my ac would only blow cold out of driver side and controls wouldn't change from vent to defrost. So I replaced control module and all actuators as well as did the reset process. Its blowing heat on both sides but not as strong on passenger side also it still will not change vents or cool.

 

[Geotrash]

Gotta get a good scan tool on it that can read the hvac module and tell you what the doors are being commanded to do vs what they’re actually doing. Did you use GM parts?

 

[swathdiver]

I have a 2008 Tahoe Ltz one day my ac would only blow cold out of driver side and controls wouldn't change from vent to defrost. So I replaced control module and all actuators as well as did the reset process. Its blowing heat on both sides but not as strong on passenger side also it still will not change vents or cool.

A new control module must be programmed to the vehicles, they are not plug and play. The Apple Car Scanner app can read BCM codes on IPhones. If you have one or access to a bi-directional scan tool, pull up the internal BCM codes. It will tell you which actuators are bad and why with the symptom code following like, B0413 61 or B0413 05.



Having said all that, your Mode Actuator is the likely culprit here, it's the one in the driver's footwell. Aftermarket sensors don't last, buy once, cry once, for GM OE/ACDelco, same box or wrapper with both numbers.

 

[Keonsr10]

 

[Keonsr10]

All actuators are brand new and still not working I've done the reset process 4 times still nothing. These are the codes it keeps throwing.

 

[Keonsr10]

All actuators are brand new and still not working I've done the reset process 4 times still nothing. These are the codes it keeps throwing

Gotta get a good scan tool on it that can read the hvac module and tell you what the doors are being commanded to do vs what they’re actually doing. Did you use GM parts?

I purchased aftermarket off amazon

 

[mikez71]

Any updates? Do the actuators move when doing the calibration?

 

[Keonsr10]

Any updates? Do the actuators move when doing the calibration?

They don't move at all I bench test all of them they worked fine one of the new ones was bad

 

[Keonsr10]

Update:

 

[j91z28d1]

Update:

replacing the hvac modual and not programming it might lead to a communication issue. which is what that seems like?