Overheat
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Senior User
Joined: Jul 2009
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From: Ashland, Mississippi
Overheat
2004 F250, 6L, 239k
Driving on interstate and temp gauge skyrockets. Immediately pull over and shut it down. Proceed to check everything out, no leaking, oil is clean (no water). After engine cooled for about 30 minutes I started engine then tapped (pretty hard) on the thermostat. Engine didn’t get hot and drove the 130 miles home, just as I turn the corner by my house the temp begins to shoot up again. I’m thinking the thermostat has failed and stuck closed. The tapping or just cooling allowed the thermostat to open? Opinions?
Driving on interstate and temp gauge skyrockets. Immediately pull over and shut it down. Proceed to check everything out, no leaking, oil is clean (no water). After engine cooled for about 30 minutes I started engine then tapped (pretty hard) on the thermostat. Engine didn’t get hot and drove the 130 miles home, just as I turn the corner by my house the temp begins to shoot up again. I’m thinking the thermostat has failed and stuck closed. The tapping or just cooling allowed the thermostat to open? Opinions?
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
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From: Fresno, CA
Definitely get a scanner hooked up so you can read the live data from the ECT. The fan should be roaring long before the stock temp gauge starts moving above normal so you may have a sensor issue.
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From: Ashland, Mississippi
No monitor so I will replace the thermostat tomorrow and see what happens. Will post on results.
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From: Ashland, Mississippi
Old thermostat removed and tested bad. New thermostat installed and all seems good in the cooling system. Now however I’m getting no turbo boost. Wasn’t having any issues before. Is there some kind of limp mode that kicks in? Also no check engine light is on.
thanks,
Richard
thanks,
Richard
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Originally Posted by URDADDY
Old thermostat removed and tested bad. New thermostat installed and all seems good in the cooling system. Now however I’m getting no turbo boost. Wasn’t having any issues before. Is there some kind of limp mode that kicks in? Also no check engine light is on.
thanks,
Richard
thanks,
Richard
Regarding your boost situation, it'd take a close look at the ebps and connector. Make sure it didn't get wet or a wire isn't chaffed.
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Senior User
Joined: Jul 2009
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From: Ashland, Mississippi
I really can’t say for sure it’s a loss of boost, 04 has no boost gauge and my hearing isn’t good so I can’t hear the turbo. It does however have a huge loss of power. Push it to the floor and it slowly accelerates and shifts hard.
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Senior User
Joined: Jul 2009
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From: Ashland, Mississippi
I ordered a scan gauge that will be here Friday. Hoping it will help answer a few questions. I did wonder about the limp mode. Disconnected negative battery cables for about 10 minutes and reconnected hoping to reset everything. Still having the same issue.
Logistics Pro
Joined: Jul 2014
Posts: 4,673
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From: Houston, Texas
Dang, hardly anyone buys Scangauge anymore. For $30 you can get a BAFX Bluetooth adapter and have your pick of $5 phone apps, TorquePro or Forscan. Or the free PC version of Forscan, if you have a Bluetooth PC/tablet.
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