Question about 2005 GMC Sierra
Coolant in system ??
Coolant flowing through 'Heater Core' ??
Code(s) present w/Scanned ??
Possible HVAC issue(s);Blend air door n HVAC box (Under Dash)-Temp Actuator-HVAC control head @ dash.....
Posted on Dec 11, 2014
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Posted on Jan 02, 2017
Turn your AC off. Turn the car off Crank the car turn ac on drivers side to 60 passenger side to 90 press auto wait 1 minute turn AC off (very important) turn car off turn car back on switch driver's side 90 passenger 60 press auto wait one minute turn AC off( very important) turn car off turn car on AC 70 both sides press auto your ac should be blowing cold If not, you have an expensive problem
Posted on Aug 12, 2009
Probably the left temp actuator. The wires in the right I/P junction block could have poor tension also, but it's usually the temp actuator.
Posted on Oct 02, 2009
I have had this problem. I am not a mechanic...so to correct the issue temporarily, I simply turn off the car and restart. This has worked everytime for me. In extreme cases, I think you can also remove the AC fuse and start the car, which will also reset the computer. I also think that by taking the climate control off the "AUTO" setting has worked in the past.
Posted on Oct 27, 2009
Make sure that your coolant is full. That is usualy the cause.When you are at idle there is not sufficent coolant to be pushed thru the heater core.
Posted on Jan 05, 2010
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