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We drove from Illinois to Tennessee yesterday and I was watching the transmission temp when we started doing a lot of uphill and downhill driving. I noticed the trans would get up to 221° and then it would drop down to about 207 and then work its way back up and then back down so I'm assuming the system is designed to cool down the fluid once it reaches 221.
I know the transmission cooler is underneath the truck next to the transmission and I'm just curious if anyone knows how the logic works. From what I remember the transmission cooler uses engine coolant to cool down the trans fluid. Does the computer open a valve when the trans gets up to 221° and cycle trans fluid through the transmission cooler?
I'm used to the old school setup where there was a cooler mounted in front of the radiator that constantly cooled the fluid
It is thermostatically controlled, don't know the particulars of temps and conditions, but the trans and fluid are supposed to run hotter than older ones, better efficiency.
We drove from Illinois to Tennessee yesterday and I was watching the transmission temp when we started doing a lot of uphill and downhill driving. I noticed the trans would get up to 221° and then it would drop down to about 207 and then work its way back up and then back down so I'm assuming the system is designed to cool down the fluid once it reaches 221.
I know the transmission cooler is underneath the truck next to the transmission and I'm just curious if anyone knows how the logic works. From what I remember the transmission cooler uses engine coolant to cool down the trans fluid. Does the computer open a valve when the trans gets up to 221° and cycle trans fluid through the transmission cooler?
Everyone looks at this as a cooler but it’s more than that. As @Gladstone posted the transmission cooler is really a heat exchanger and it works both ways. It also transfers heat from warm engine coolant to cold transmission fluid on cold starts. And as mentioned above it is thermostatically controlled to maintain an optimal operating temperature range
Both my ‘20 F250 & ‘22 F350 (7.3 in both) will not get above 100 degrees if ambient temp is 32ish(f) or colder for at least 15 miles at highway speed. Realistically they will not start to get warm until I get into city traffic and start working through the gears a bit.
Both my ‘20 F250 & ‘22 F350 (7.3 in both) will not get above 100 degrees if ambient temp is 32ish(f) or colder for at least 15 miles at highway speed. Realistically they will not start to get warm until I get into city traffic and start working through the gears a bit.
Mine usually breaks 100 degrees in less than a mile with a few minute warm up.
Both my ‘20 F250 & ‘22 F350 (7.3 in both) will not get above 100 degrees if ambient temp is 32ish(f) or colder for at least 15 miles at highway speed. Realistically they will not start to get warm until I get into city traffic and start working through the gears a bit.
Same, but I have a 6.7. I have 5 to 6 miles before I get to any sort of larger road where I can get up to speed. Not sure if that contributes or not.
Aside from the coolant flow being directed at different temps the cooling fan operation plays a part too. OP didn't say what year his truck is, but here's an older post from 2018 that explains the different stages of the cooling fan. I've never noticed the lower stages of fan operation, but can definitely hear when it kicks in above that 225 degree mark!
From the thread: "Anything over 200 f and the fans on stage 1, 215,stage 2, 218 stage 3, full 100% above about 225."
