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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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#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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