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I would be thinking it is a head gasket.

2007-03-22 00:57:48
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Would a thermostat set for a higher temperature keep the heater from blowing hot air?

No. The thermostat controls the flow of water through the radiator, not the heating core. Using a thermostat with a higher temperature rating delay the opening of the thermostat (and the flow of water to the radiator) until that higher temperature is reached. This will cause the coolant to run hotter.


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The temperature gauge goes down when you drive faster because more air is passing over the engine to cool it. Sounds like you need a new thermostat. This is part of the cooling system, and has nothing to do with air filters or spark plugs. A thermostat is easy to replace. It will be where the upper radiator hose connects to the engine block. Remove the hose clamp, pull the hose off the nipple, and it is sitting right there. The thermostat is supposed to sense when your coolant is getting too hot. Then it should open and allow the coolant to run into the radiator, where it is cooled off. The water pump then pushes the cooled water back into the water jacket surrounding the engine block, where the hot water rises to where the thermostat is, to begin the cycle again. When a thermostat goes bad and does not open, the water stays in the jacket and gets hotter and hotter, and has no chance to cool down in the radiator. Eventually the engine overheats, unless you drive fast enough that the air rushing by keeps the temperature under control. In an emergency when the car is overheating in traffic, turn your heater's temperature to the maximum heat position. Even with the fan off, this will work. It sends the hot coolant through the heater core, which is like a mini radiator and will help cool down the coolant.


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My question is, where is the engine coolant temperature sensor located, in a cylinder head or in the intake manifold close to the thermostat? If it is in a cylinder head it will give you a hotter reading than if it was in the intake manifold.


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