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The first time my trans overheated I was hauling 33k lbs so I thought that contributed to it. Now it overheats just driving the truck for an hour. I no longer think the trans cooler is the problem. After talking to Allison about the trans, I’m gonna be ordering a reman trans and put that in...

Today I bypassed the thermostatic valve. Temps are finally within range and functioning normal. I looked under my M1088 and it doesn’t have that valve. It just runs both coolers in series. I took some temp pics of before and after. The first pic shows high temp at the input of the aux cooler...

I did add an override and even with the fans running 100%, the trans is still overheating. That makes me think that valve is stuck closed and not allowing fluid to the aux cooler. Going to confirm tomorrow. Hopefully that valve is serviceable.

I may end up doing that tomorrow. I’ll let you know how it goes. Probably should start my own thread instead of hijacking this one. Just wanted to jump on here because there seemed to be some good knowledge on it.

How are you planning on routing that? Are you just going to run both coolers in series and then back to the trans? I’m going to take this thermostat valve apart tomorrow and see if it’s stuck. If it’s not salvageable, I may be looking into running them both in series. I wonder if the reason...

Well I guess they are calling the front heat exchanger a cooler also. On this they call that thing a thermostatic valve that directs flow to the aux cooler. I think mine may be stuck closed. Anyone ever have that happen to them or have one apart? Even with my fans on 100%, my trans is...

Do you have any idea what the thermostat valve is behind the transfer case? I’m trying to diagnose my transmission overheating within 30 minutes of driving. Everyone is calling the heat exchanger under the radiator a cooler but I almost feel like it’s designed to heat the trans fluid to get it...