Question about 1998 Cadillac Seville

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I have a 98 cadillac sls and it runs hot if the freezeplugs are bad will that be the reason. i have already changed the radiator,thermostat and waterpump

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Did you burp the cooling system after changing those parts? If not, you have to. Jack up the car so that the thermostat is pointing upward, and start the car. Let it run until it's 3/4 of the way to overheating. Then shut it off and let it cool. When it's cooled down and safe to open the radiator cap, do so - this will burp the trapped air bubbles out of the system. The coolant level will go down, now that the bubbles are gone, so top off the coolant. You may want to do it a second time to be sure, and then you should be set. If not, you have more serious issues (potentially bad head gaskets, for example).

Posted on Nov 12, 2009

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1998 Cadillac Seville SLS with overheating problem. Head gaskets repaired!! cost me 4K, all hoses checked and look good, belts replaced etc etc. Still overheats!! The cooling system (heating/AC) is acting...


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Allow it to cool down and refill system while running with heater on hot. Hopefully this will get the air out of the system. However, if this condition persists, have the radiator checked for hydrocarbons. These engines are sensitive to overheat and you may have blown a head gasket. (hope not)
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try flushing the system.you may have some restrictions in the motor, but first remove the radiator cap before it gets to hot,but hot enough for the thermostat to be open,and make sure you have flowing coolant.If not your water pump is bad.The fluid should be moving quite a bit.

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