Cooler by-pass valve
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Joined: Oct 2006
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Cooler by-pass valve
I enjoy reading this forum, lots of info. But now I have a problem. My trans overheated yeasterday. No load on truck in about 10 miles heated to 230 deg.
When I got it home I felt the cooling lines, they were cool but the trans. pan was hot. I did overheat it once last spring towing 14,000 lb. 5er. After that I changed fluid and filter towed trailer to New Mexico and back to Ark. With now probnlems. Then I started learning some things on this site so I put in a 6.0 trans. cooler. Test drove it empty about 40 miles, no problem about 125-150 degs. Truck sat from then until yesterday when I had the overheating. Any advice greatly appreciated. This is a 01 F-250, 4X4, Superchips tow safe, Autometer on pillar. 108,000 miles.
kThanks,
Mike.
When I got it home I felt the cooling lines, they were cool but the trans. pan was hot. I did overheat it once last spring towing 14,000 lb. 5er. After that I changed fluid and filter towed trailer to New Mexico and back to Ark. With now probnlems. Then I started learning some things on this site so I put in a 6.0 trans. cooler. Test drove it empty about 40 miles, no problem about 125-150 degs. Truck sat from then until yesterday when I had the overheating. Any advice greatly appreciated. This is a 01 F-250, 4X4, Superchips tow safe, Autometer on pillar. 108,000 miles.
kThanks,
Mike.
Post Fiend
Joined: Jun 2006
Posts: 5,497
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From: Central, Al
There is a bypass valve on the trans itself on the passenger side a line runs between the output and input side of the cooler lines. Sounds like yours is stuck open and you have no flow through the cooler. Or in a rare case the cooler is plugged. At 230* change the fluid when you fix it just to be safe.
Senior User
Joined: Dec 2004
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From: Bethlehem Ga.
O1Lariot I had the same thing happen to me I was towing up a mountain run hot and blowed all the trany fluid out . Dont know where it come out at but it all come out. After I got it home Filled it back up and it works perfect. Hooked camper back up went to pull some hills in the neighborhood and it still working good no leaks or over heating . Ive done the flow test and it checks OK. No oil was coming out of the rear port on tranny either. The only thing I can figure is if the bypass valve stuck momentarly and it got hot and burped the fluid out and then closed. I dont know but I have never seen a tranny fix itself. Anyone else ever experinced this? Good luck.
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Update. I just removed the rear line from the tran. and started truck I had more fluid coming out of the trans. than ot of the line, not good. Then I tried to take the line going to the radiator but I couldnt break it loose, so I seperated the hose off the other side of the rad. that connects to the trans. cooler. Started truck again, no flow there but fluid still coming out of the rear trans. connection. I got a real mess now doing this alone.ha ha. Does this sound to you like it is the cooler bypass valve or the internal pump. Im hoping its the bypass. I think I can do that myself.
Thanks for any advice
Mike.
Thanks for any advice
Mike.
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
