Question about 2000 Ford Escort

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Hello, I have a problem with a heat, mechanic replaced thermostate, water pump, radiator, also blowed air out heater core. But problem still there. It gives me cold air, water gauge moves a little from cold toward hot, then drops down ( several times) then it goes to middle and I get hot air and again can drop to cold. Seems mechanic changed everything. Does anyone knows what might be causing this... Thank you

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Mightbe defective thermostat

Posted on Dec 30, 2010

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Nobody knows this little secret. Not even Subaru mechanics at the dealer, no TSB (Technical Service Bulletins a special note after the fact to mechanics). After days and days of trouble shooting a 1993 Subaru Impreza (2.0?) I looked at the water flow chart and then it was clear what was happening. This phantom overheating problem stumps the best mechanics and sends many Subarus to the crusher.

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