Transmission Cooler Flow Test
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
It's probably worthwhile to run a cooler flow test.
Warm the trans up. It should be at least 150°F.
Have two containers, each at least one gallon.
Get a hose that will fit over the cooler return line at the rear of the trans.
Remove the return line where it enters the rear of the trans.
Put the hose on the return line and put it into container #1.
Have a helper start the engine and leave it in park and at idle.
When the flow is steady out of the hose (that should only take a few seconds) move the hose to container #2 for EXACTLY 15 seconds, then put it back in container #1.
Shut the engine off.
Results:
If fluid sprayed out of the transmission, the test fails. A small dribble is fine, but spraying is not.
If there is less than a quart in container #2 the test fails.
If the test fails either the cooler bypass valve is stuck open or there is a restriction in the cooler circuit.
Warm the trans up. It should be at least 150°F.
Have two containers, each at least one gallon.
Get a hose that will fit over the cooler return line at the rear of the trans.
Remove the return line where it enters the rear of the trans.
Put the hose on the return line and put it into container #1.
Have a helper start the engine and leave it in park and at idle.
When the flow is steady out of the hose (that should only take a few seconds) move the hose to container #2 for EXACTLY 15 seconds, then put it back in container #1.
Shut the engine off.
Results:
If fluid sprayed out of the transmission, the test fails. A small dribble is fine, but spraying is not.
If there is less than a quart in container #2 the test fails.
If the test fails either the cooler bypass valve is stuck open or there is a restriction in the cooler circuit.
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Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
The above post was copied from a trans thread in the Excursion forum to it's own thread for purposes of linking to the Excursion forum tech folder. That's why it's here and not in the transmission forum.
Stewart
Stewart
Last edited by Stewart_H; Jul 27, 2019 at 01:41 PM.
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