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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Re: What is causing my 99 ford f150 to overheat while on...
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.
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First The heading says 99 Taurus but the question says 99 f-150. Second, are you saying that the engine is overheating? The heater won't work if the level of coolant is low and that would explain overheating. The thermostat controls the temp of the heat, so if it is stuck closed then water can't circulate to the heater and the vehicle would overheat, but this is unlikely.
the other answers seem to concentrate on a non-working heater. Good luck with this problem.
Does it slowly overheat while driving down the highway..If so the radiator is probably clogged..It can be partially clogged and cause the car to overheat,,but usually takes a little while...If it overheats in traffic..(stop and go ),,but does fine going down the road,,then it make sure your fan is coming on..
is the cooling fan operating properly(on and off at proper temps),does the rad have a flow problem this can cause it as well.you don`t say when and how long it takes to overheat.sitting idling for long periods of time,driving in the city only,on the highway,coming off the highway,only on acceleration,only with the a/c on.all these factors can make a difference in finding the problem.have you told the shop when and how its overheating.you may have to drive it under the same situation to get it to over heat and take it to the dealer and have them check it out when its happening or take it to a shop as dealer techs won`t spend as much time on it as they should because they are paid flat rate and if nothing shows in short order they kick it out the door and move onto a paying job.
Hello, gbh257 and thank you for asking your question on Fixya! Here is a simple process that will walk you through a few steps that
will pinpoint the overheating problem on your 97 f150,
without even using any tools. It has helped millions of people, and I am
certain that it will help you, because I wrote it for people in your exact situation. How to diagnose an overheating Ford truck
When driving down highway only, it overheats? When running steady, I take it you mean, sitting idling? If it's only overheating at highway speeds, and all else has been checked out & is o.k., I'd take a close look at rad hoses for soft spots (easy to squeeze) that may be causing hoses to collapse at highway speeds & restricting flow of cooling system. Another thing to try is, turn your heater on high fan & high temperature when it starts to heat up & see if temperature gauge goes down (cooler) at all. If it does, then rad not doing it's job properly.
possibilities include: fan clutch, water pump going out, missing fan shroud or baffles in front end, clogged radiator fins or a/c condensor may need cleaned. Possibly stuck thermostat, low coolant level , and this can be caused by faulty radiator cap. Hope this helps!