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How do I test the thermostat on 2008 Ford F150 4.2L

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REMOVE THE RADIATOR CAP WITH ENGINE COOL,FILL RADIATOR,START ENGINE, LET IT RUN ,AFTER ENGINE GETS TO OPERATING TEMP COOLANT SHOULD FLOW. IF ENGINE OVERHEATS AND BLOWS A LOT OF COOLANT OUT THERMOSTAT IS BAD.DOING SAME PROCEDURE IF IT STARTS GUSHING COOLANT WHEN IT IS STILL COOL YOU MOST LIKELY HAVE A BLOWN HEAD GASKET.THIS CAN BE CONFERMED BY DOING A BLOCK TEST THAT CHECKS FOR COMBUSTION GASSES IN THE COOLING SYSTEM.

Posted on Dec 08, 2014

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Posted on Jan 02, 2017

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