Question about 2002 Cadillac Sts

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My 1998 STS is still overheating after replacing the thermostat. The fans work. The radiator is clear. I have no reason to think the water pump is not working. I have a new temp sensor, but have not located the one I will replace yet. Any suggestions?

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Did you try replacing the radiator cap? Most over looked problem I have seen, and does the hose to the overflow tank leak? Do you have antifreeze in it? Look inside the radiator while the car is running if the water is moving then the pump is ok if not then the pump may be bad. I have seen water pump shafts break and the impeller not turn and show no other symptoms but when removed found the shaft broke.

Posted on Jul 02, 2009

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Hate to say it, but the same thing happened to me a couple of weeks ago with my 98 STS. Sounds like you have a head problem which is very bad and expensive. Instead of replacing the heads I just found a 2002 STS engine with 25k miles on it and am dropping it in there.

Posted on Jul 08, 2009

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Look for oil in the anti-freeze and visa-versa... hopefully you find none. If you do' your block needs work, and with it being alluminum, that would be bad. In wich I'm sure that would require some profesional help. Even tried runnin with the thermostat out. After I replaced it twice... Still overheating.. I alredy replaced the water pump, and I'm running out of ideas... I wish you luck..! Hopefully you could help me too if you are able to fix yours

Posted on Jul 02, 2009

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