Question about 2000 GMC Sierra
When the air temperature outside is 100 degrees f. or higher at times my a/c blows cool air instead of cold air. i checked the temperature of both lines going to the evaporator at the firewall and they are appx. 34 degrees f. also once this weekend the blower motor delayed coming on for 2-3 seconds. the a/c works normally when the outside air temp is 90 degrees or lower. I'm thinking it's possibly the a/c control panel in the dash not sending the correct information to a blend door motor or a bad blend door motor or both. have you seen this before?
Posted by Anonymous on
If you want a quick check of the blend door system,clamp off the heater hoses,as you would if you were changing a heater core and drive as you would.Do not disconnect them,just clamp them.
Also,don't over look air flow through the a/c condenser at the front,any restriction of air flow or a slow fan or only one running of 2 when 2 are needed?
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Posted on Jan 02, 2017
There is only one A/C system split into 2 zones. Check the blend door actuator, it may have failed in one position or something may be jamming it. Also check the control panel in the dash, My 98 yukon did the same thing, no matter what temp you selected for the front it would blow at about 70 degrees. There is a circuit board in the control panel that gets corroded and one of the circuits controls blend door operations. Have a look.
Posted on Jun 12, 2008
Same car, same problem. Press MODE, FRONT and REAR buttons together to reset tempreture. You probably need to replace the sensor GM part number 15047946 it is in the front grill email me for a picture. firstname.lastname@example.org
Posted on Jun 28, 2009
Make sure you have fully charged AC sytem first, if so Im sorry to tell you this but this is a difficult deal.you may not be able to correct this without taking it to a repair shop with gm scan tool. Reason being the actuators for the hvac that most likely are malfunctioning from either them or another component being bad , require recalibration.The other reason would be the body control module related.It would have to be scanned for U codes which can effect the hvac control.Sorry but thats what I know.
Posted on Sep 06, 2009
Testimonial: "Tahnk you for your prompt reply. That is about what I figured I was gonna hear, on to the shop I guess."
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
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