Help, Tranny still running hot!!!
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Senior User
Joined: Jun 2005
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From: Houston, TX
Help, Tranny still running hot!!!
Okay, I've flushed, changed filters, re-built the tranny to tune of $3250, triple lock tq, improved valve bodies, more clutches, etc, added Tru-Cool max filter and the tranny still runs 170-190* in traffic. Ambient temps in 90s, humidity high but driving very conservatively and empty. High temps seem intermittent.
Could the valve that opens and closes for fluid to go to the cooler be sticking? Can that be replaced w/o dropping the tranny? If so, is that a dealer part? I'm planning on playing with cooler lines to see taking factory cooler out of loop makes a difference. Any other ideas?
Could the valve that opens and closes for fluid to go to the cooler be sticking? Can that be replaced w/o dropping the tranny? If so, is that a dealer part? I'm planning on playing with cooler lines to see taking factory cooler out of loop makes a difference. Any other ideas?
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From: Kiefer, Northeastern Okla
Did you have to or just want to do all that to your tranny? You might want to discon your lines at the tranny and blow clean dry air through it. It's a little messy, but it's a cheap and easy place to start if you think 170's too warm. cookie88's right, it sounds about right to me.
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Joined: Nov 2004
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From: New Hampshire
i agree with you, i think 170 is a little high, 190 is deffinately high.... running my mule around in the same heat and humidity... 140... maybe 160... but that's it... and as soon as i'm moving, 140 or a little under... i don't think those temps are harmful to your tranny, but i wouldn't want my mule running those temps either...
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To check the cooler flow, warm up the trans. Then with the engine off remove the cooler line from the rear of the trans. Put a 1/2" OD rubber line over the end of the cooler line so that you can get it out from under the truck.
Point the line into a container. Start the engine. A couple of seconds after the flow starts move the line to a second container. Keep it in the second container for exactly 15 seconds, then back to the first container, then shut the engine off.
You should have at least one quart in the second container. If not, there is a problem.
Refill the trans before driving!
You can blow out the lines, and do all that you have listed before and you probably won't change the temperature at all because 170-190°F is absolutely normal!
Point the line into a container. Start the engine. A couple of seconds after the flow starts move the line to a second container. Keep it in the second container for exactly 15 seconds, then back to the first container, then shut the engine off.
You should have at least one quart in the second container. If not, there is a problem.
Refill the trans before driving!
You can blow out the lines, and do all that you have listed before and you probably won't change the temperature at all because 170-190°F is absolutely normal!
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From: Houston, TX
[/QUOTE] You can blow out the lines, and do all that you have listed before and you probably won't change the temperature at all because 170-190°F is absolutely normal![/QUOTE]
The problem is that when I get out of traffic and am going 55 or so non-stop, the temp doesn't drop and sometimes goes on up to 200*. It appears that something is intermittently preventing flow through the coolers. I have the factory cooler plus a tru-cool cooler and still running these temps. If those are normal temps for an empty truck then I'll live with, just feels like a bit on the high side. BTW, I really appreciate the feedback and help.
Mike
The problem is that when I get out of traffic and am going 55 or so non-stop, the temp doesn't drop and sometimes goes on up to 200*. It appears that something is intermittently preventing flow through the coolers. I have the factory cooler plus a tru-cool cooler and still running these temps. If those are normal temps for an empty truck then I'll live with, just feels like a bit on the high side. BTW, I really appreciate the feedback and help.
Mike
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Then run the cooler flow check that I described above. That will tell you if there is a restriction in the cooling flow, or a leak in the cooler bypass.
The bypass is in the black tube that connects the cooler lines on the passenger side of the transmission. It can be replaced without removing the transmission.
The bypass is in the black tube that connects the cooler lines on the passenger side of the transmission. It can be replaced without removing the transmission.
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From: Woodburn, OR
Does the transmission fluid pass thru the radiator before it goes to the transmission cooler? The temperatures that you are seeing are about what the water temperature should be. It is possible that the lines got reversed when they transmission work was done.
Read the Optimal Tranny temp post from Tazzmann
Read the Optimal Tranny temp post from Tazzmann
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Originally Posted by willbd
Does the transmission fluid pass thru the radiator before it goes to the transmission cooler? The temperatures that you are seeing are about what the water temperature should be. It is possible that the lines got reversed when they transmission work was done.
Read the Optimal Tranny temp post from Tazzmann
Read the Optimal Tranny temp post from Tazzmann
Warren
