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SUVs Buick Rainier Buick Rainier, Chevy TrailBlazer, GMC Envoy
18277 messages, Last post on Nov 18, 2009 at 6:43 AM
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Desperate to hear other's experiences. I live in Tucson where temps are often 100+. My '03 EXT w/ 5.3 runs hot anytime the temp is above about 98. Usually stays steady at the 195 mark, however, when outside temps rise so does the running temp. Not unusual at all to see 230 or even 235 when in slow moving traffic and 100+ outside temps. (I am talking about 3 or 3.5 marks above the 210 center mark.) This is with no load and not towing. Anyone else see anything close to this? Dealer has reprogrammed PCM and replaced fan clutch, twice. No change. Any ideas appreciated. I can't imagine it is supposed to run this hot and I am only 1500 miles from warranty expiration. Wifes' Malibu doesn't do this. The Silverado rental I just had stayed pegged at 195 as well. Also, the ignition switch has been replaced three times (and this one needs adjusted). Left me stranded twice with no start due to switch. Junky switches or is something causing to go bad? Thanks Wxman
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Replying to: wxman4 (Jun 23, 2005 3:19 pm) 
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Replying to: dmathews3 (Jun 23, 2005 4:55 pm) Thanks Wxman |
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Replying to: wxman4 (Jun 23, 2005 3:19 pm)
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Replying to: gmfan (Jun 24, 2005 4:57 am) Just plain water? There's about 3 1/2 gallons capacity in a full system. A gallon of water added would dilute the coolant mix ratio down quite a bit, which will lower the boiling point, and if you've added plain water in the past, even more so. I keep a jug with premixed 50/50 DexCool and distilled water for occasional topping off. In 3 1/2 years, haven't had to add more than 6 to 8 oz a year to keep at the full mark.
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Replying to: 01_hoe (Jun 22, 2005 12:15 pm)  I dunno what to do now. to those that suggest I try to replace the bulb, is there a micro bulb I can but from radio Shack and try to fix it myself? Do I need a soldering gun? I want that fixed it drives me batty to see the light not working 
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Replying to: 02envoyowner (Jun 06, 2005 6:27 pm) thanks
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Replying to: tblazed (Jun 24, 2005 6:05 am)
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Replying to: gmfan (Jun 24, 2005 10:15 am) Might have just been the fan kicking in for more cooling and it took a minute for it to cool down and register on the gauge. Especially if it stabilized at 210°. If you've been adding in some Dexcool with the water, it's probably OK. You could check it with an antifreeze tester (or antifreeze refractometer if you want to get fancy!)  A friend of mine had a Taurus with an overheating problem. All signs were the water pump was OK - no leak, no noise- but turned out the impeller was loose on the shaft, not turning or pumping enough. They replaced the fan clutch, thermostat, and radiator before they figured that one out.
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Replying to: tblazed (Jun 24, 2005 2:07 pm) No problems with coolant level, etc. As a side note, the new fan clutch and PCM programming have helped the AC, if not the coolant temp. That is also a reason I am beginning to think it is not an "air" problem, but a flow problem of some sort. If air has been increased enough to improve AC and the coolant does not run any lower then I am thinking the problem is elsewhere. Going in again next week. Thanks Wxman |
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