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Comments
agreed.
g
My bumping noise occured when you turned on the ignition to start or auxillary and also when you turned off the ignition. It would last for maybe 30 seconds or so. Now, I have seen people asking for instructions about how to remove the dash and all the work that that involves.
OK here was my solution:
By looking and feeling under the dash at the heater I could pretty much feel where the noise was coming from. It was right at a little vent door under the heater. (maybe, it is called a blend door) Anyway I found that when It was making this bumping noise that if I pushed up on the door on the unhinged side the noise stopped. So I thought, why not try to just block it open with something and see if that would stop the bumping. I had a little length of about 1/2 in. gas line left from another project. I cut off a piece about an inch & a half long and wedged it in between the door and where it seated itself. WaLa, no more noise.
I don't guarantee it will work for your problem but it worked for me, and so far everthing seems to work perfectly normal with the heater. So it saved me pulling the dash as suggested by many blogs that I have read in either work or the cost to take it to a shop. If you have the same problem maybe it will work for you. If it works you can send me the $600. or so that people have said it costs to fix. I"m kidding. To tell you the truth it took longer to write this blog than to fix the problem.
disclaimer: I don't guarantee that it doesn't cause a problem but I havn't had any problem myself.
http://www.gmpartsdirect.com/catalog/frameset.cfm
Enter year make model
under hvac---> controls-->dash control unit.
You will have four selections. To be sure you order the correct one you will need to email them with your vin prior to ordering.
Or you could have yours rebuilt here:
rebuilt
I couldn't find any listing for a used replacement unit at this time. You could search ebay for GMC HVAC controller.
Could there be a short somewhere.
Thanks, steve
Thanks
thanks,
Magman1
What could be the issue?
Can I get just the part of the harness I need, or do I have to cut it out of a used truck at a salvage yard and splice it?
Also-Besides adding an aftermarket kill switch for the A/C compressor when the selector goes into the Floor/defrost blend, is there any way of making it not come on? I understand the reason for it, to dry the air, but sometimes all you need is a little bit of heat to clear the windows, without having to use extra gas to run the A/C.
Please let me know if there's a fix for this, as well as a fix for the defroster-A/C issue
But i get out and check the heater core hoses and one is hot and other is cold, so i drained the antifreeze and flushed system out and seemed to be dirty coming out of heater core.. Put all back together and worked for a week and a half and now i am back to same problem... As i messed with it more i have noticed that once i rev the engine up to bout 3500-4000 rpm the heater gets hot and then let off and goes back to blowing warm/cool air.... so i wonder if water pump is weak???
i am at a lose and wondering what to do next! anyone have any suggestions???
Have you been back to the dealer to address your concerns? If not I would definitely recommend doing that first. Please keep me updated on your situation.
Christina
GM Customer Service