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Your 1999 GMC Jimmy is overheating how can you tell if it's the thermostat?
Wiki User
∙ 15y ago
its such a cheap part I would just replace it... Check the temperature of the upper radiator hose. If it isn't hot, the thermostat is probably stuck shut.
Wiki User
∙ 15y ago
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Your 1999 Buick century keeps overheating you bought this car from an auction They said it needed head gaskets because of the overheating So you did that Then you changed the thermostat water pump and?
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one of the things that could be casing your ovreheating problem is a stuck thermostat. The thermostat stays closed until the engine gets to a certaqin temperature and then opens up to cool the engine. if the thermostat fails to open no coolent gets to the engine therfore causing the engine to overheat. one way to tell if your thermostat is going out is your upper radiator hose where the themostat housing is will be stretched and feel kinda rubbery. hope this helps could also be that your water pump is going and or a broken water pump belt...but id go with the thermostat first.then take it from there.
Where is the thermostat located on a 1995 Toyota Camry?
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How can you tell if you new a water pump?
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