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What is causing my 99 ford f150 to overheat while on the highway

(female needing help ) my 1999 ford f150 overheats while driving on the highway at any speed. the heat gage will go to hot until i turn on the heat on then the gage will slowly go back to normal until i turn the heat off then it will go back up to hot again. i am not getting any steam or loss of fluids just signs of the truck overheating by the gage. i have put the truck in for service but they were not able to find anything that would be causing it to overheat. i have replaced the thermostate with a new one. i am not sure if it would be my clutch fan of water pump. can you please help i am at my wits end and not sure what to try next.

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Try washingthe raditor at a car wash wash thre the engine compartment to the outside. clean the ac fan condensor then check that the fan is not loose next replace the anitfreeze if it's more than two years old, and the radiator cap if it still does it replace the thermostate gasket, these are the most common problems for over heating. you could have a clutch fan bad too but do the other stuff first it's cheeper.

Posted on Jun 21, 2009

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I would try replacing the clutch fan with another you can get that from a junk yard so you dont put out a lot of money in case that dont work if not then i woudl go with a new water pump

Posted on Jun 21, 2009

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