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coolant fan not working change the temperature sender located on the engine ( follow the wires from the fan ) failing that the cylinder head could be warped check for water in the engine oil ( oil looks like mayonaise)or check if theirs any trace of steam from the exhaust when hot Try replacing the water pump too.

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Q: Your 2001 jetta keeps overheating- you just replaced the thermostat and it is still overheating there are no leaks or anything though- what could be wrong?
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