Hvac help

[roadrash187]

Need help with my system. Installed both a new blower motor, resistor, and control panel. Spliced in the harness that came with the new resistor. It will still cut in and out. Im at a loss and dont know what else it could be. Could it possibly be one of the temperature sensors even though its not set on auto?

 

[OR VietVet]

Are you still having the same initial problem or is the current problem different? Product component manufacturer? Please do not say Dorman.

 

[tRidiot]

Unfortunately for some things, Dorman is all you can get. I know my rear AC is borked and while I replaced the blend door, the control unit is discontinued and no longer available anywhere. So I'm just screwed forevermore, I guess.

 

[Doubeleive]

If you have the manual control hvac what happens with those usually is the metal contacts inside get funky and don't make good contact anymore you can take them apart and clean the contacts and put them back together and usually it will work fine again

 

[roadrash187]

Are you still having the same initial problem or is the current problem different? Product component manufacturer? Please do not say Dorman.

I forgot to add its for my Denali. So it has digital controls.

The controller is from Dorman. The resistor and blower motor are “AC Delco” from Rockauto.

I replaced the blower motor and resistor back in Aug. with some brand off of Amazon. So I figured it was cuz of some no name brand. But Im thinkin of trying to find an OEM controller off of ebay and hope for the best.

 

[OR VietVet]

ebay is a source for the controllers.

 

[tRidiot]

If you have the manual control hvac what happens with those usually is the metal contacts inside get funky and don't make good contact anymore you can take them apart and clean the contacts and put them back together and usually it will work fine again

I'm sure mine is the controller or something. I buy a new blend door, go through the relearn/reprogram procedure and it overdrove the door and it jumped track. That was years ago, I've been manually changing it twice a year for 8 or more years now. So I bought a new AC Delco door and it wouldn't change at all. I deinstalled that to protect it, and looked at the part upstream - the controller. When I plugged that number in at Amazon, it told me I'd bought that same part back in 2014 or something. <facepalm> A Dorman, of course, but you can't get the AC Delco.

So I dunno what else to do. I bought a Tech2 clone so I could try to manually operate things and see what is going on - I just don't know how to use it. And haven't had the time to learn.

 

[Fless]

Sometimes there are updated calibrations for the controllers, available standalone in TIS2000 with an XP computer, or through the GM online programming system. I believe you'd need to know the part number of the controller you want to update, since there seem to be several different calibrations, each unique to the module.

Out of curiosity, if you post up the GM part number of your module, I could try to see if an updated calibration is available. But you'd also need to use your Tech 2 to see what the current calibration is on it.

 

[tRidiot]

Man it would be awesome to be able to get my rear AC working properly again. I am just going to have to watch some videos and learn how to use this tool.

 

[roadrash187]

Is yours just blowing out cold air on the rear no matter the temp setting?