hot trans temps
Postmaster
Joined: Nov 2003
Posts: 3,595
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From: Utah County, UT
I did not flush the stock cooler out when I installed mine as I had just flushed the entire system about 1 mo. before I installed the cooler. So if you have not had the system flushed, then yes I would flush it out before installing the new cooler. Not sure what you mean by hardlines running along the bottom of the radiator, first thought is that they are for the power steering. If you look at the passenger side of the transmission there are two lines coming out. These two hardlines lead up front and are the sameones that I took pics of. If you have it installed on these lines it is correct. If your temps are still in the 200s, then pull the return line off and run it into a bucket. Have someone start the truck, verify flow out. your bypass valve may be stuck closed, or your stock cooler may be clogged. If you have good flow then I don't know. I'd recomend a shift kit to help. What type of driving are you doing to get into the 200 deg temp range? Also, how did you install the temp probe?
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Senior User
Joined: Oct 2005
Posts: 177
Likes: 1
From: Mukwonago, WI
under the truck on the bottom of the radiator there are 2 hard lines run that go through the radiator opn the bottom. i know one is for the trans because it comes off the line and down to the bottom of the radiator, i thought the other one was the return line but now i think it is for the power steering. that is the one i have it returning to but now i think it is the return for the power steering. im going to change it tomorrow and see if that is the problem. i pulled what i thought was the return line off and trans fluid came out but i forgot the p.s. pump also uses trans fluid.
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Senior User
Joined: Oct 2005
Posts: 177
Likes: 1
From: Mukwonago, WI
thanks for the help everyone i got it installed the right way and now i dont see temps over 110 it helped cool it down a lot hopefully my tranny will last a little longer it wasnt hard at all once i realized i had it hooked into the wrong line
-Justin
-Justin
Senior User
Joined: Oct 2004
Posts: 371
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On my 250 with stock coolers, running empty, my transmission teimperature indication runs at or below the temperature in the bottom radiator tank. The hot coolant from the engine enters the top tank at 180 - 200 degrees, and cools as it goes down the tubes. On a hot day it leaves the bottom tank at maybe 160 degrees, a cold day at maybe around 100 degrees. The oil-to-air cooler out front can only cool the tranny fluid off some more. My sensor, installed in the tranny test port, seems to track that lower radiator tank temperature fairly closely. Your 200 plus degrees is certainly not normal. Go back to the guy that installed the guages and have him check it out.
Hopefully he is a good PSD tech.
Warren
Hopefully he is a good PSD tech.
Warren
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Senior User
Joined: Oct 2005
Posts: 177
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From: Mukwonago, WI
Originally Posted by cangim
Good to hear you got if working 
Do you know what line you had it hooked into before?
Do you know what line you had it hooked into before?it was the p.s line i dont know if it was the return or the inlet. it was the one at the bottom of the radiator next to the stock trans cooler inlet. i thought it was the trans return because they are right next to each other along the bottom of the radiator but it wasnt. at least my power steering pump ran cool for a while
i installed the guages myself but i also realized i diddnt ground my tranny guage but what was weird is that it seemed to read normal but just got hot. you would think it wouldnt read at all if it wasnt grounded as soon as i grounded it the reading went to 150 with the stock cooler and after the tru-cool max it barely moves anymore.
thanks for helping me along cangim
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bkcowboss
1994.5 - 1997 7.3L Power Stroke Diesel
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