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swilliamson
Dodge Dakota
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4/08/2004
16:28:28

Subject: Transmission Cooling lines
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I am going to install an aftermarket cooler this weekend, and was wondering which line, top or bottom, is the send line, and which is the return line from the transmission? I want to make sure I add that cooler before the radiator.

'97 Dakota CC 3.9l Automatic (42RE, I think?)



another mark
Dodge Dakota
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4/08/2004
20:02:20

RE: Transmission Cooling lines
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Pressure line is the lower line according to the 1999 FSM.



Dave B.
Dodge Dakota
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4/08/2004
20:06:23

RE: Transmission Cooling lines
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Hello,

I just replaced both of my Transmission cooling lines on my 1998 Dakota with the 42RE tranny. The one that goes to the top of the radiator cooler is the pressure side (feed) and the one that goes to the bottom of the radiator cooler is the return. The feed line has a section of rubber hose on it that contains a check valve that is suppose to prevent the tranny fluid from flowing back into the torque converter when parked. The check valve has been known to jam and not open to allow fluid to flow through the cooler. You can test this fairly easily with low air pressure.

Dave



another mark
Dodge Dakota
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4/08/2004
20:23:19

RE: Transmission Cooling lines
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Well there you have it. Flip a coin. Looks like I'm guessing when I do mine too.



Dave B.
Dodge Dakota
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4/08/2004
21:17:55

RE: Transmission Cooling lines
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Hello again,

Just to let know that I was confused as hell with these tranny lines too. I have the 1998 FSM and they had a small illustration of the cooling lines going from the tranny to the cooling tank back to the tranny using arrowed flow lines. My confusion began when I ran into the problem with the stuck check valve. I tried to verify the flow path but nothing was coming out because of the bad valve. To make things even more confusing, both lines have "tanged" line connectors on the cooler end of the lines. the check valve hose is a seperate line and is connected by a "Tanged" connector. The return line has a "Tanged" line connector to SAE female flange that connects to a small section of line that connects to the bottom of the cooler.
The lines were in vey bad condition (almost rusted through) so I decided to go and get new ones from the dealer. I talked to a mechanic and he confirmed that the check valves on these lines go bad often. He also confirmed to me that the tranny fluid flows from the line that comes from the front of the transmission (Pressure line) through the check valve to the top of the cooler and the return goes from the bottom of the cooler to the line that goes to the rear of the transmission. I dropped the pan and did the band adjustments, changed the fiter and filled and flushed the tranny, torque converter and cooler and used about 14 1/2 quarts of amsoil ATF.

Dave



another mark
Dodge Dakota
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4/08/2004
21:26:26

RE: Transmission Cooling lines
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They use a cool little tool in the FSM to do this flush. It looks like you hook it to the battery and its a pump and sucks out the fluid through the cooler lines. Wish I could buy one of these somewhere.



Dave B.
Dodge Dakota
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4/08/2004
21:30:59

RE: Transmission Cooling lines
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I seen that in my FSM.... I can imagine the small fortune they charge to rent that sucker.

Dave



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