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2025 3.0 transmission heater
- Thread starter swine
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vincentw56
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As far as I know, there is and has never been a transmission heater.
swine
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Really? In what? The 5th gen, the 2025's, or in Ram's in general? The 4th gen 8hp70 had them.
vincentw56
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In any. Never heard of such a thing in any vehicle unless it is something for cold weather to plug in. The transmission gets heated by drving it. It could get some heat transfer from the radiator as it heats up but won't be much.
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vincentw56
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Wow, that's interesting. I stand corrected. My 2020 seems to only heat up while driving. Maybe they aren't as powerful as the older ones.
swine
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Thanks, Jimmy. I crawled under and confirmed. It definitely doesn't heat like my 2015.
I noticed the other day that the trans seem very slow to warm up. Decided to test them both. The 2015 was parked outside, ambient air temp 18°. Ran for 20 minutes, trans got up to 107° Started the 2025 in the garage, ambient temp 46°. Also ran for 20 minutes, trans only got up to 79°. Even when driving I've noticed the '25 trans takes a long time to come up to temp. Anyone with actual knowledge that can chime in? Is it normal?
I noticed the other day that the trans seem very slow to warm up. Decided to test them both. The 2015 was parked outside, ambient air temp 18°. Ran for 20 minutes, trans got up to 107° Started the 2025 in the garage, ambient temp 46°. Also ran for 20 minutes, trans only got up to 79°. Even when driving I've noticed the '25 trans takes a long time to come up to temp. Anyone with actual knowledge that can chime in? Is it normal?
vincentw56
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My 2020 takes awhile to heat too. That's why I figured there was no such thing.
2025Rebelguy
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I would expect it to be a thermostatically controlled cooler more than a heater? Maybe the early version was constantly flowing (no temp control)?
BowDown
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Ive been watching my 2020 the last few days because its been so cold, mine slowly heats up as well. With 24° ambient temps, it takes about 8 miles for the trans to get to 140°, distance from my house to the gym
I think these transmissions heat up so slowly as there is very little frictional losses within the transmissions themselves, which is a good thing.
The heat exchanger used for the transmissions on these trucks definitely functions to both cool and warm the transmission with the same coolant the trucks engine uses, and until that is up to temp I doubt the trucks programming would allow the transmission to steal heat from the coolant.
I’ve driven in temps as low as -40 with no transmission issues due to cold fluid temps, I do run the winter grille cover along with 4wd for most of the winter. Block heater is used anytime the temperature falls below -20C, and remote starts to get some heat through the truck before driving.
The heat exchanger used for the transmissions on these trucks definitely functions to both cool and warm the transmission with the same coolant the trucks engine uses, and until that is up to temp I doubt the trucks programming would allow the transmission to steal heat from the coolant.
I’ve driven in temps as low as -40 with no transmission issues due to cold fluid temps, I do run the winter grille cover along with 4wd for most of the winter. Block heater is used anytime the temperature falls below -20C, and remote starts to get some heat through the truck before driving.
