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'94 honda civic is overheating, temp gauge is reading 3/4 up, replaced thermostat, worse now gauge is reading upper white line, just below the red mark, cooling fan is workikg and no obvious leaks, could it bethe water pump?

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Yes it looks like it. Provided you installed the thermostat in the correct direction, Here's the test, remove the radiator cap, start the car and wait for the engine to warm up, When you can see the temp begin to rise on the gauge the thermostat will open. While reving the engine look for turbulance in the coolant/antifreeze in the radiator opening.
If none is observed then replace the water pump.

Posted on Jul 27, 2009

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There could be an obstruction in you radiator or your water pump may have failed.

If you are loosing coolant but there is no obvious leak it could also be that a head gasket failed internally.

There could also be air trapped in the cooling system.

Posted on Jul 27, 2009

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