Trans temp / cooler bypass valve
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Elder User
Joined: May 2002
Posts: 858
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From: Robbinsville NJ
Trans temp / cooler bypass valve
My tranny usually runs at about 125 degrees, yesterday afternoon and this mornings commute it hit was running at 180 - 190.
I figured it was the cooler bypass valve and called a dealer to check on the price. It's $86 including the washer kit, and he states he has never ordered one am I positive I need it. My thoughts are I know the temp since I have an aftermarket gauge, the factory gauge still reads "normal" so the average driver wouldn't know there is a problem until the tranny melts.
Am I going down the right path by replacing the valve? It's cold outside, is it a quick in the driveway kind of job or should I have someone install it for me?
Thanks,
Rich
I figured it was the cooler bypass valve and called a dealer to check on the price. It's $86 including the washer kit, and he states he has never ordered one am I positive I need it. My thoughts are I know the temp since I have an aftermarket gauge, the factory gauge still reads "normal" so the average driver wouldn't know there is a problem until the tranny melts.
Am I going down the right path by replacing the valve? It's cold outside, is it a quick in the driveway kind of job or should I have someone install it for me?
Thanks,
Rich
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
I wonder how you arrived at a bad bypass valve? All it has is a ball and a spring. There really isn't much to go wrong.
If it is bypassing the coolers it's probably because one or both of the coolers are plugged. Does either cooler line get hot when the trans is at 180-190? If so, then the bypass is not bypassing. If both lines are cold and the trans is hot, then it is bypassing. The question then would be why.
If it is bypassing the coolers it's probably because one or both of the coolers are plugged. Does either cooler line get hot when the trans is at 180-190? If so, then the bypass is not bypassing. If both lines are cold and the trans is hot, then it is bypassing. The question then would be why.
