Trans overheating, OD and AC go off - Page 2 - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #13 of 32 (permalink) Old 03-25-2019, 08:16 AM
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I have heard of heat exchangers going bad and filling the transmission with coolant and ruining them.

My transmission would overheat alarmingly fast without it during commercial operation. Now my transmission will just barely get to 240* hot line (around 190-200 pan temp) climbing a bit hill with a heavy load.

If your coolant/transmission exchanger looks ok and coolant was mantained you should be ok.


Daily driver/ workhorse: 1994 2500SLT 4x4 Auto. Hewitt EGT, Boost, Trans gauges, Under hood Mech FP gauge, Trident fuel lines, Tork Tek OFV, Mag-Hytec DD Transmission Pan, Ford manual hub conversion, Diamond eye 4" turbo back, 37337 Upgrade. 260K

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post #14 of 32 (permalink) Old 03-25-2019, 11:33 AM
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I'm skeptical on the factory heat exchanger being prone to failure. I haven't heard of this and to the best of my knowledge there are plenty of trucks out there with 2-3x the mileage of your truck still running the original. It's really a pretty simple part, just an enclosed housing with hose connections for the trans fluid and coolant. No moving parts or anything like that to worry about.

At a minimum, I think you need an secondary transmission cooler if you choose to ditch the exchanger. But, at that point, why not just reinstall the exchanger since you already have it?

As for the A/C, this will require some more digging. It wouldn't surprise me if the trans overheating O/D lockout also cut out the A/C, just to reduce overall heat from the vehicle, but I'm really not sure.

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post #15 of 32 (permalink) Old 03-25-2019, 12:34 PM
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Quote:
Originally Posted by alanack6795 View Post
I have heard of heat exchangers going bad and filling the transmission with coolant and ruining them.
This is scary. Is there any rhyme or reason to why they go bad? Would improper maintenance to the trans fluid and/or coolant contribute? Replacing it wouldn't be such a big deal, except for the Cummins part I've found is upwards of $900 which seems INSANE.

Cheeze, you might consider looking into Mishimoto's aftermarket trans cooler. It mounts at the factory cooler location in front of the intercooler. It is a beefy unit with double the fin surface area and fluid capacity over stock. I have one in my truck and it works great. I'm not suggesting it as a substitute for a secondary cooler or the heat exchanger, but it's not terribly expensive for the amount of extra cooling ability you get. Part # MMTC-RAM-94SL

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post #16 of 32 (permalink) Old 03-25-2019, 01:08 PM
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Quote:
Originally Posted by alanack6795 View Post
I have heard of heat exchangers going bad and filling the transmission with coolant and ruining them.

My transmission would overheat alarmingly fast without it during commercial operation. Now my transmission will just barely get to 240* hot line (around 190-200 pan temp) climbing a bit hill with a heavy load.

If your coolant/transmission exchanger looks ok and coolant was mantained you should be ok.
I have heard of this with other brand vehicles, but never these trucks. The only failures with contamination I think I've ever read about are the reverse - transmission fluid in the cooling system.

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post #17 of 32 (permalink) Old 03-25-2019, 02:09 PM
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Quote:
Originally Posted by alanack6795 View Post
I have heard of heat exchangers going bad and filling the transmission with coolant and ruining them.

My transmission would overheat alarmingly fast without it during commercial operation. Now my transmission will just barely get to 240* hot line (around 190-200 pan temp) climbing a bit hill with a heavy load.

If your coolant/transmission exchanger looks ok and coolant was mantained you should be ok.
I have heard of this with other brand vehicles, but never these trucks. The only failures with contamination I think I've ever read about are the reverse - transmission fluid in the cooling system.
Most cooling systems have about 9-16 psi in them, I think the pressure in the cooler lines for the transmission is about 20-40psi
I don't know what would happen when the truck is shut off, I think the cooling system will hold pressure and leak into the transmission.
My heat exchanger is off D89/Tony's truck because mine was missing for unknown reasons.

I would guess It has over 300,000 miles on it .

Unless the cooling system is in piss poor condition I would imagine it would last forever...
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Daily driver/ workhorse: 1994 2500SLT 4x4 Auto. Hewitt EGT, Boost, Trans gauges, Under hood Mech FP gauge, Trident fuel lines, Tork Tek OFV, Mag-Hytec DD Transmission Pan, Ford manual hub conversion, Diamond eye 4" turbo back, 37337 Upgrade. 260K

98 2500slt 4x4 ECLB moldy G56, south bend clutch 3rd gen trac bar , boxed control arms, billet tappet cover w/ dual breathers trident fuel lines, Tork Tek OFV, 4' stainless side dump with muffler 240k
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post #18 of 32 (permalink) Old 03-26-2019, 08:53 AM
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I have a buddy that his heat exchanger went bad and filled his trans with coolant. I had to remove mine when I put compounds on it so I used a derale 15870 under the bed of the truck. I rarely turned the fan on and when I did, it would cool the fluid down quick.

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post #19 of 32 (permalink) Old 03-28-2019, 01:20 AM Thread Starter
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It's reconnected to the heat exchanger now. I still plan to put a new fan clutch on it because the compressor is cycling a lot and it gets warm when it's idling on a hot day, high side pressure goes up like there is not enough airflow across the condenser. Hopefully this will = problems solved.

Thank you all for your input.
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post #20 of 32 (permalink) Old 03-28-2019, 07:10 AM
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Originally Posted by Cheeze View Post
It's reconnected to the heat exchanger now. I still plan to put a new fan clutch on it because the compressor is cycling a lot and it gets warm when it's idling on a hot day, high side pressure goes up like there is not enough airflow across the condenser. Hopefully this will = problems solved.
Thank you all for your input.
Is everything clean and unobstructed?

Daily driver/ workhorse: 1994 2500SLT 4x4 Auto. Hewitt EGT, Boost, Trans gauges, Under hood Mech FP gauge, Trident fuel lines, Tork Tek OFV, Mag-Hytec DD Transmission Pan, Ford manual hub conversion, Diamond eye 4" turbo back, 37337 Upgrade. 260K

98 2500slt 4x4 ECLB moldy G56, south bend clutch 3rd gen trac bar , boxed control arms, billet tappet cover w/ dual breathers trident fuel lines, Tork Tek OFV, 4' stainless side dump with muffler 240k
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post #21 of 32 (permalink) Old 03-29-2019, 02:45 AM Thread Starter
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Yes, I've cleaned the cooling fins on all the coolers up front. No obstructions. I used to hear the fan at times really pulling air, sounded like a jet, but I haven't heard that much air movement in a long time.

96 12 valve club cab lwb 2500 2wd 250k 3.55 gears, 265/75-r16, OFV at 30, no plate, AFC full fwd, HX35 at 35 psi boost, Timing~16.5, 5x11s, 2790 BHAF, Banks hi-flo muffler, 3.5" exhaust, Deleted prefilter & heater, mildly built 47re, billet single TC. KDPF
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post #22 of 32 (permalink) Old 04-05-2019, 09:03 PM Thread Starter
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So far, so good. I just pulled the camper home after a two hour drive and checked the pan temp when I pulled into the yard. 167 degrees. I'm glad I went back to the heat exchanger.

96 12 valve club cab lwb 2500 2wd 250k 3.55 gears, 265/75-r16, OFV at 30, no plate, AFC full fwd, HX35 at 35 psi boost, Timing~16.5, 5x11s, 2790 BHAF, Banks hi-flo muffler, 3.5" exhaust, Deleted prefilter & heater, mildly built 47re, billet single TC. KDPF
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post #23 of 32 (permalink) Old 04-05-2019, 09:45 PM
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That heat exchanger needs to be on. If you disconnect the the hot water side it will cool the trans better. I would never remove completely unless I was adding another remote cooler. It sounds to me like your trans guy is trying to kill your trans so you'll come back for another. Also 200 deg is way too hot. it shouldn't go over 170 to 180 max!

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post #24 of 32 (permalink) Old 04-05-2019, 09:59 PM
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I also found removing the factory cooler that's mounted to the intercooler/radiator is killing the radiators attempt at keeping things cool since it's blowing 200 deg air into it. How can we expect it to cool anything??? So I ditched mine and mounted an double stack trans cooler with a fan under the bed. So far it looks promising.

03 Dodge SHO CCLB Dually Banks intercooler 4" side draft intake. Carli/Thuren Argon filled Shocks, radius arms, SRW 4 link Conversion, 17"methods, 42" Goodyear MTR Kevlar Tires / 6 in a row ready to tow! NO BUSTERS
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