Question about 2001 Chevrolet Suburban

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My 2000 suburban runs hot most of the time. If I keep it under 50mph, it usually stays at about 190degrees, but if I run it at 55mph or above it will increase to 210 within about 2-5min. then up to 230 within another 2-5min. and usually stays there. However if I'm really pushing the motor at 70+mph it will go up to about 250 and the warning light comes on. Then I have to let it sit for 10-15min. and it cools back down to 190 and the process starts over again. Running the heater full blast helps some. I had a coolant flush and it keeps doing this. I've suspected it is the thermostat not responding correctly, though I don't think it's just always stuck closed. I'm about to replace the thermostat. Should I?

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Sounds like a very good idea....also check that, when you do, that you vent the topmost hot hose of any air in system(souds silly but IT works)

Posted on Nov 06, 2010


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