Question about 1998 Buick Century

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'98 Century--Sporadic over-heating

Can't figure this out! Have flushed radiator and replaced with new coolant. Sporadic over-heating, usually in Winter. Added stop leak since fluid was continually low, does not seem to accept coolant from resevoir. Blows cold air until gauge is far too high and then comes back down to mid-range. Will change thermostat and hope for the best! Any suggestions on problem or BEST way to change thermostat as I've had problems with bolts stripping in the past. Thanks a million!!
Wats

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  • Anonymous Jan 23, 2009

    Might Be An Engine module chip, happened to my car, replaced it and it drove fine after that.


  • Anonymous Apr 12, 2009

    I had the same problem and took it in to a shop. Indeed, purging the coolant system of air fixed the problem, but I was told that the problem was caused by old and cracking gaskets, which was common for this make/model. They recommended I make sure to keep an eye on my coolant levels to prevent future air bubbles and to have the gaskets replaced asap ($800), as it was possibly leaking coolant into the valve chamber along with the air intake and causing damage there.

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  • Buick Master
  • 6,674 Answers

Be sure to have heater (not defrost) on when refilling rad with coolant, and leave cap off until rad fan has come on & off 2 or 3 times, then replace cap. Airlocks are common on vehicles cooling systems, and will cause symptoms you are describing.

Posted on Jan 24, 2009

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