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GMC Jimmy Climate Control Problems

82 messages,  Last post on Oct 11, 2009 at 6:56 AM

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What is this discussion about? GMC Jimmy, Heating / Cooling, SUV

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#77 of 82 HELP! 98 Jimmy only blows HOT air by rdumer Jul 02, 2009 (6:42 am)
I've read everyone's problems and comments on this issue, but I still NEED help! My 98 Jimmy only blows HOT air, not just outside temp air, but HOT air. We did the 'reset' procedure, removed the BAT RDO fuze waited 10 secs, replaced it, put the key in on position and waited >1 mins for the ECC to reset, BUT it didn't fix it. When we push the 'a/c' button on the climate control panel, the light goes on and the compressor under the hood kicks in, AND the lines to/from the compressor at COLD, but the air blowing in the car is HOT.   Originally I took to a 'shop' and they suggested replaced the Climate control panel (I have been trying to located a used one, b/c the new GM ones are $300) but I can't find one, plus reading the posts some people have done this with NO success.   Since the compressor feels COLD, I think there is freon...and the blower buttons seem to be acting correctly (actually the reset 'might' have allowed the blower to respond..not sure at this point if that changed or its just our imagination, hoping the 'reset' did something!)   Should our next step be check the 'doors' in the area beside/behind the glove box? to see if they are stuck?   I read about a potimenter (sp?) is that the same thing as the actuator doors?   This is my daughter's car, limited money, so we don't want to spend a forture on mechanic bills.. ANY SUGGESTIONS ARE APPRECIATED!!!! Replies to this message: rbaumgras (Jul 28, 2009 6:03 pm)
#78 of 82 Re: HELP! 98 Jimmy only blows HOT air [rdumer] by rbaumgras Jul 28, 2009 (6:03 pm)
Replying to: rdumer (Jul 02, 2009 6:42 am) Because the Main Gear in the Blend Motor has cracked and is now not turning the heat/cold door to the Cold position. 3 fixes: Buy a new Blend motor, takes about 5mins to replace. Buy a new Blend Motor Gear, will take about 30mins to fix. Repair current gear with Epoxy, takes about 30mins and 12hrs for the glue to set up strong enough to use it.   http://wiki.answers.com/Q/Why_would_your_98_GMC_Jimmy_blow_hot_air_even_when_the- _temperature_gauge_is_set_to_cold   Hope this helps. Have not checked my Jimmy yet but I have the same problem. Will check it out tomorrow but this sounds like the real fix.
#80 of 82 A/C compressors runs, blowing cold air, regardless of climate setting by ziggysanderson Sep 26, 2009 (10:26 am)
Greetings, On a 2000 GMC Jimmy I have recently discovered that my "no heat blowing" issue is due to the fact that my a/c compressor is running as soon as I turn on ANY of the temp controls. Once I removed the fuse for the A/C compressor, the temperature controls will blow hot/cold as per the control setting, with/without using climate control. Any idea why my a/c is continuing cool/run when the settings are for heat and the A/C is not even turned on via the switch? Thanks in advance. Replies to this message: anothercup1 (Oct 11, 2009 5:24 am) ziggysanderson (Oct 11, 2009 6:56 am)
#81 of 82 Re: A/C compressors runs, blowing cold air, regardless of climate setting [ziggysanderson] by anothercup1 Oct 11, 2009 (5:24 am)
Replying to: ziggysanderson (Sep 26, 2009 10:26 am)      I just had this same problem on my 2000 gmc jimmy. The air coming out of the vents was always super cold or sometimes super hot. Took it to a mechanic to look at and he said it was the heater door actuator. Cost would be 4 hours labor (have to take the dashboard apart) and a $80 part. Ended up doing myself and found the new part for $47 and if you have small enough hands you can do it without removing dash.      On mine it is located behind glove box, just drop glove box down and let it hang. Behind it you will find the vent selector control, its round and has a single wire leading to it, take the wire off and pop the control up and move it to the side. Just behind that and up a little is the heater actuator. Two nuts in front and left side that you can take off with a ratchet. It is a tight space, but if you just get screws to turn a little you can do the rest with your finger and ratchet piece. Then pop off bad actuator and turn the knob that actuator sat on to the center position so it matches your new parts position. Put the actuator on, put the nuts back on and connect wires, put selector control back and your done.      I had this problem for a few years and struggled every season beacuse heat/ac wouldn't switch back and forth. This fixed the problem. Replies to this message: ziggysanderson (Oct 11, 2009 6:56 am)
#82 of 82 Re: A/C compressors runs, blowing cold air, regardless of climate setting [anothercup1] by ziggysanderson Oct 11, 2009 (6:56 am)
Replying to: anothercup1 (Oct 11, 2009 5:24 am) Thanks a lot the for reply, I had a feeling it was due to the heat actuater but I wasn't able to locate it but that should be a problem now... cheers!   Ian

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