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GMC Jimmy Heating Ventilation Air Conditioning

7 messages,  Last post on Dec 11, 2008 at 5:17 PM

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#1 of 7 Jimmy Heat cool.....then warm?????????? by drogersgolf Nov 20, 2008 (11:15 am)
My jimmy just started blowing cold air at idle and slower speeds, but when I get up to higher speeds (50mph) or more it blows warm or hot air. I also noticed that my 4 wheel drive don't work either, not sure if these problems are related.   Clueless and not a mechanic,   Donnie Replies to this message: mwolf9000 (Nov 21, 2008 6:49 am) emilewski (Nov 24, 2008 7:29 am) drogersgolf (Nov 24, 2008 11:35 am)
#2 of 7 Re: Jimmy Heat cool.....then warm?????????? [drogersgolf] by mwolf9000 Nov 21, 2008 (6:49 am)
Replying to: drogersgolf (Nov 20, 2008 11:15 am) You might not have enough coolant in your radiator. And you could check the fuse for the 4wd in the fuse box by the driver door. That's a start.
#3 of 7 Re: Jimmy Heat cool.....then warm?????????? [drogersgolf] by emilewski Nov 24, 2008 (7:29 am)
Replying to: drogersgolf (Nov 20, 2008 11:15 am) hey, drogersgolf  I'm having the same problem with my heat, if you get any suggestions that work let me know please. thank you. Replies to this message: drogersgolf (Nov 24, 2008 11:35 am)
#4 of 7 Re: Jimmy Heat cool.....then warm?????????? [emilewski] by drogersgolf Nov 24, 2008 (11:35 am)
Replying to: emilewski (Nov 24, 2008 7:29 am) I put 1 gallon of anti-freeze in the radiator and my heat starting working right away. Thank you for the suggestion and easy fix.
#5 of 7 RPM jumping when heat is on by nljewell Dec 02, 2008 (6:12 am)
A few yrs. ago I was out of state and my alternator took a crap. Had it replaced and ever since my rpm's will surge up alittle when my heat is on. Any ideas?
#6 of 7 Temp. Sending Unit/ Normal Temp? by nljewell Dec 10, 2008 (1:56 pm)
My 99 Jimmy (4.3 Vortec) has been hesitating when first taking off from a stop only when engine is cold. I have replaced plugs and wires, cap and rotor, egr valve, fuel filter, had my fuel pressure and cat convertor tested (both good), and I just replaced my temp. sending unit. Before I was running at about 165 degrees, now I'm getting about 190 degrees after adding coolant that was lost after taking old unit out. Is that normal temp? And I think I added more coolant than I needed in resevoir, is that ok or should I take some out? And a little tip if you're replacing your temp. sending unit, use a wrench to tighten new one, I used a socket to get old one out and i broke the wire connector off. Replies to this message: nljewell (Dec 11, 2008 5:17 pm)
#7 of 7 Re: Temp. Sending Unit/ Normal Temp? [nljewell] by nljewell Dec 11, 2008 (5:17 pm)
Replying to: nljewell (Dec 10, 2008 1:56 pm) Just drove my Jimmy for the first time since changing my temp. sending unit. It's Thursday night and I haven't drove it since Sunday night. It took off great with no hesitation. Finally. Cheap and easy part to replace too. The gallon of Dex-Cool was just a couple $ cheaper than the part itself. Hope this helps someone in the future.

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