The HVAC controller in my base 07 3LT occasionally goes rouge on me so I’m looking for another one. I’ve been searching and noticed different model numbers on the units. Question is, do I need to buy one with the same model number or can I buy any controller for a C6 with electronic climate control?

 

Here is the OEM part number for an 07 from Alldata…I would not trust any car Forum to give you the right number…I’d go down to your nearest Chevy dealer with your VIN and they can tell you the latest part number.

 

Ok, Will do. Thanks

 

Rouge as in like your going through menopause with heat.cool swings?

If yes, then controler could be fine, and problem is cabin air temp sensor is not longer in bezel, but knock loose and in the bowels of the dash instead.

To the left of the ignition switch a few inches, there are some vents in the bezel. Take a light and shine is in to slots, and look for a blue bulb that you can see just behind the slots.

https://i.ebayimg.com/images/g/jpMAA...rL/s-l1600.jpg


If you do not see the blue bulb, then will need to pull the benzel, pull the cabin temp switch back out of the bowels of the dash, pop it back onto is bezel cup, and when re-installing the bezel, make sure it does not pop back out of the bezel cup socket when you snap the bottom of bezel in.

Good video on how to pull the bezel,

And to add, if cabin sensor is still in bezel socket, not a bad idea to pull the bezel, so you can pull the senor to clean its fan and bulb if there is a lot of build up. Hence way sensor works, has a fan on the back side to pull air from the cabin to get cabin temp, but fan blades can get filthy, lack of enough air pulled through sensor to keep up with changing temps in the cabin itself.
The fan blades are the open slots just below the bulb end of sensor,
https://i.ebayimg.com/images/g/cRIAA...qrN/s-l960.jpg

Short of that, them maybe HVAC controller needs to come apart, to check its boards for cold solder joint, or loose cable ribbon to one of the connector. Hence only time you want to think about replacing controller, is when you wear the printing off the buttons, and don't want to play the sticker game to get the labeling back on to the buttons.

 

What I mean by rouge is that when it’s working it’s working fine. Then usually at the most in opportune time when I start the car the temperature doesn’t show and the unit is totally inop. Then after several starts which could be days it comes back. Sometimes it works and the display looks like hieroglyphics. I’ve tried keeping it on the trickle charger and pulling the fuse but it doesn’t seem to help. I can send mine out for repair which is over $500 so I am thinking of going with a good used unit.

 

I have the same issue with my 2010 GS However it is not as severe as yours. Mine will go blank a couple times a summer. But, it will come back on and work fine for weeks. It usually come back on within 30 minutes or so. It appears to default to the last setting when it goes out. I have started to turn the system off when parked.
I have purchased a 2012 unit as a standby just in case. So far it is only a minor inconvenience but I want to be ready just in case.

 

It’s irritating to say the least. When it’s working I’m like eh just leave it. It’s when it goes wonky when I need it that drives me crazy. Sometimes the screen will be blank then all of a sudden will come on when I’m driving. Always happens on start up. It never goes out when it’s on.

 

I wonder if turning it off when parked will help.

 

I always turn the unit off before I shut the car off.

 

Did you have problems with the HVAC controller. If you did did it help.

 

When it’s working all the functions work as they should. This past May I had the car judged at an NCRS regional where it worked flawlessly🙏🏻. I’m sure the previous owner had this problem but of course failed to share it with me.

 

Cold solder joint on board, or ribbon cable not connected all the way into connector.

Since you would have to remove it anyways to replace it, when you have it out, pull it apart to check for the above.

 

Ok thanks. When I take it out I’ll open it up and see if I can tackle it. If not I’ll see if I can find a good used one before I send mine out for repair which.

 

Who repairs these?

 

Vehiclemodule.com

 

Are they the same company as Auto and truck electronics? If so they do not have good reviews.
Can anyone share their experience with them.

 

Looks like the same company from the website.

 

That is what I thought. A previous post advised everyone to stay away from Auto and Truck Electronics. I was hoping this was a better option.