98 Deville Northstar temp runs up to 240 when idle
Runs rough at startup then reaches temp around 198 and smoothes out and runs very nice. temp will run up when sitting for 5-10 min but when I go agian it comes down and runs fine. Service engine soon is on and Autozone cmptr reads elec temp sensor that I cant locate. I just bought it 2 weeks ago and it does have some white smoke that clears when it wams up so I dont know if it was condensation. It is losing about 1/2 gallon antifreeze per week. Do I have blown head gaskets? Will any leak stop work? Thank you.199 Cadillac Coupe Deville, northstar engine, Check engine light comes on, goes off, engine temperature readings normally 196, go up to 244, come down within 2 minutes to 222, drop tp 198 in next two minutes. After a day of driving low on antifreeze about 3 pints each day.
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Re: 98 Deville Northstar temp runs up to 240 when idle
Might want to check that radiator for any leeks, if not check the watter pump for any leeks too, my car was doing the same 2 different times, first time radiator had a crack and was leeking, making me buy antifreeze almost every day, secont time was the water pump, was too old and started leeking , needed replacement
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Check engine light flashing means there is a bad misfire , it flashes to tell you your damaging your catalytic converter . You need to have it check , you don't won't to have to replace the catalytic converter . Can cost up to $1,000.00 . Flashing Check Engine Light CarMD
Hello: You may have a stopped up radiator. A temp sensing heat sensor will tell you. Auto Zone or advance auto. Are you sure the head gasket is not leaking? Does coolant fill up the surge tank and bubble with engine running????
Could be a few things but either way, don't wait to have the cooling system checked out, do it now & possibly save $1000's later.
Check your coolant level first, make sure all belts are there. Rad fan should be coming on when it reaches operating temperature etc. Just bought it from who, a dealer? If it was a dealer head back to him a.s.a.p. and give him a chance to make it right, and pay close attention to what he says it is/was.
Yes it is headgasket. Mine had same problem. Yours might not be severe as of now, you can try these other solutions. THERMAGASKET... Which you can buy online, and get your money back if it does not work... And stuff in a bottle at Autozone Repair headgasket with NanoTechnology! I would try and sell it quick, because these engines are very costly to repair and most mechanics wont even attempt headgasket repair, and plus you have to TimeSert the block...