Question about 1998 Cadillac Seville

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Overheating bigtime i have a 1998 sts and it keeps losing coolant

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  • eric forbes
    eric forbes May 27, 2008

    i have a 1998 sts running hot and losing coolant please help

    ewforbes0710@bccc.edu


  • cindy1370 Jan 12, 2009

    I have a 1998 Cadillac Seville SLS with 4.6 Northstar motor. Replaced thermostat, radiator, and water pump, also overflow cap. Still overheating, gauge reads above half way mark. No smoke from exhaust and no water or antifreeze in the oil. Please help, noone can figure out our problem. Thanks

  • kelvin_mike_ Feb 03, 2009

    cadillac sts over heating and loosing coolant radiator fan not coming on

  • garvisjr Apr 20, 2009

    gauage on 98 sts staying above half way when in idle and cooling most of the time when you drive. replaced radiator,thermostat,waterpump. No smoke from tail pipe and no water in oil. please help

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  • 640 Answers

Is the temp gauge high?Does the car blow white smoke?Check the oil and see if you have antifreeze/water in the oil.You may have a blown head gasket.Im assuming you have a norhtstar motor.

Posted on May 27, 2008

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1 Answer

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With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

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There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

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sounds like it might be low on coolant. Low coolant levels will stop the flow and circulation to the heater core, and also might be the cause of overheating

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Please check the radiator it may be leaking or there may be hole in the coolant container or the sensor is defective get it checked ..................................

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did you check the oil?does it look milky?

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