C4 cooling line pressure?
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FTE fan
Joined: Dec 2006
Posts: 3,674
Likes: 11
From: paradise, northern calif.
C4 cooling line pressure?
Hi guys, Im doing some re plumbing on my C4s cooling lines (adding an additional cooler and in line filter) and have a concern if a "AN" conversion fitting that uses a compression fitting as a transition from hard line to an is adequate to withstand the line pressure in the cooling lines. I have checked every site I could find, and in every case people seem to assume that the pressure at the test port, is the same as that of the cooling ports, which doesn't sound right to me. Is that fact, or fiction. I would appreciate it to no end to know what the max cooling line pressure is. My trans is a rebuilt 1970 C4 and has no issues. Thank you very much.
Senior User
Joined: Sep 2013
Posts: 329
Likes: 4
From: Deer park, Wa.
I can't tell you what the cooler line pressure is. I've only heard reference to " good flow". To check the trany pump pull the cooler line at the back of the case and check for " good flow" means the pump is working. I got this info from the ford transmission forum. Hope this helps and good luck with it.
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FTE fan
Joined: Dec 2006
Posts: 3,674
Likes: 11
From: paradise, northern calif.
I can't tell you what the cooler line pressure is. I've only heard reference to " good flow". To check the trany pump pull the cooler line at the back of the case and check for " good flow" means the pump is working. I got this info from the ford transmission forum. Hope this helps and good luck with it.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,723
Likes: 2,650
From: SE Florida
The test port is line pressure. The torque converter never sees line pressure, converter pressure is regulated to 120 PSI on later transmissions, I assume it's about the same in a C4, but I'm not certain.
The cooler circuit is a branch off the torque converter discharge. This pressure is lower than converter pressure. I would expect you would never see above 60 PSI in the cooler circuit.
Thread Starter
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FTE fan
Joined: Dec 2006
Posts: 3,674
Likes: 11
From: paradise, northern calif.
It isn't right.
The test port is line pressure. The torque converter never sees line pressure, converter pressure is regulated to 120 PSI on later transmissions, I assume it's about the same in a C4, but I'm not certain.
The cooler circuit is a branch off the torque converter discharge. This pressure is lower than converter pressure. I would expect you would never see above 60 PSI in the cooler circuit.
The test port is line pressure. The torque converter never sees line pressure, converter pressure is regulated to 120 PSI on later transmissions, I assume it's about the same in a C4, but I'm not certain.
The cooler circuit is a branch off the torque converter discharge. This pressure is lower than converter pressure. I would expect you would never see above 60 PSI in the cooler circuit.
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