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My truck keep running hot what's wrong? - 1998 Ford Explorer

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Have you checked the thermostat and/or the coolant level? SAFETY: DO NOT DO ANY OF THIS WHILE THE ENGINE IS HOT!

To check the coolant level, open the hood and look for a plastic cap with the thermometer symbol on it. (Do not confuse this with the windshield washer reservior, which has a windshield symbol on it). With the engine cold, look through the translucent plastic and compare the coolant level to the raised markings on the reservior. Fill as needed with a 50/50 mixture of coolant and distilled water.

To find the thermostat housing, follow the radiator hoses back to where they enter the engine block. You should see a hemispherical housing held on with two bolts. That is the thermostat housing. Remove the bolts and the thermostat, being careful to note how everything was positioned. Replace the housing and refill any lost coolant. Realize that we are still in the diagnostic phase. Run the engine until you are satisfied that it is not over-heating. It will not hurt the engine to run without a thermostat, but your heater will not work. To install a new thermostat, remove the housing and clean off all the old gasket and install the new one that comes with a new thermostat (if you do not clean off all the old gasket before installing the new one it will probably leak). Put the new thermostat in place in the same position as the old one, replace the housing and refill any lost coolant.

Posted on Aug 04, 2010

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