Wow, that's ridiculous! Did they at least put down the crack pipe long enough to tell you this, or was it between puffs?
Ford quietly redesigned the thermostat in 2022...replace it
- Thread starter NavigatorPro
- Start date
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5280tunage
Full Access Members
I was floored, I asked the service advisor how that's possible, my entire point was they already had the system mostly drained to do a flush.Wow, that's ridiculous! Did they at least put down the crack pipe long enough to tell you this, or was it between puffs?
Calidad
Full Access Members
More observations
First highway run fully warmed up 50 degree temps the transmission temp stabilized at 183 at 75mph flat highway no climb. Prior to the thermostat it would stabilize in the 199-212 range in the same trip and speeds. Pulling off the highway to an immediate stop
Light ie worse possible situation for the transmission temp it went to 185 for a split second then dropped back to 183. Prior trips the fan would kick on as temp hit 212-214 and the auto stop start would keep the truck running. Now it shuts off at the light.
I’m not sure what temps the auto start/stop balks at shut down but I bet it’s close to that 212 temp where the fan kicks on.
The failure mode of that faulty thermostat design is very gradual and until it triggers a 228 or higher temp on the engine temp I don’t think anyone would realize their transmission is running 10-20 degrees hotter.
In high temp and or load conditions that could definitely be a factor in transmission issues.
As the failure further alters the coolant flow and temp it will obviously impact engine temp enough to trigger the 228+ temp indicator above normal on the dash.
First highway run fully warmed up 50 degree temps the transmission temp stabilized at 183 at 75mph flat highway no climb. Prior to the thermostat it would stabilize in the 199-212 range in the same trip and speeds. Pulling off the highway to an immediate stop
Light ie worse possible situation for the transmission temp it went to 185 for a split second then dropped back to 183. Prior trips the fan would kick on as temp hit 212-214 and the auto stop start would keep the truck running. Now it shuts off at the light.
I’m not sure what temps the auto start/stop balks at shut down but I bet it’s close to that 212 temp where the fan kicks on.
The failure mode of that faulty thermostat design is very gradual and until it triggers a 228 or higher temp on the engine temp I don’t think anyone would realize their transmission is running 10-20 degrees hotter.
In high temp and or load conditions that could definitely be a factor in transmission issues.
As the failure further alters the coolant flow and temp it will obviously impact engine temp enough to trigger the 228+ temp indicator above normal on the dash.
SyndicateZ
Full Access Members
My tranny temps in the winter (10 F degree weather) would be between 208-215 normal city driving.
Calidad
Full Access Members
Trip back up hill heavier traffic 190-201.
While sitting at lights it creeps up 201. Once moving flat road it starts to drop 198-195. Which would make sense with air flow in 57 degree outside temps. No fan. Fan kicks on around 210-212.
At home 201 temp letting it idle in park took about 4 minutes to see it start dropping 199 etc.
Prior to the thermostat replacement it would be 210-215 at home and I could idle it for 15 minutes with fan running and only see 210-209 temps.
Very curious how the heat exchanger on the transmission is set up. The coolant thermostat definitely affects the trans temperature.
While sitting at lights it creeps up 201. Once moving flat road it starts to drop 198-195. Which would make sense with air flow in 57 degree outside temps. No fan. Fan kicks on around 210-212.
At home 201 temp letting it idle in park took about 4 minutes to see it start dropping 199 etc.
Prior to the thermostat replacement it would be 210-215 at home and I could idle it for 15 minutes with fan running and only see 210-209 temps.
Very curious how the heat exchanger on the transmission is set up. The coolant thermostat definitely affects the trans temperature.
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My 2018 runs the same temps with the 180 T stat I installed about a year ago. Plenty of heat even when -10 degrees out. The engines coolant on the hot side (T stat engine side) is circulated through a heat exchanger mounted on the trans which cools the trans fluid. Basically, colder the engine, the colder the coolant through the cooler. As the engine warms up, it also warms the trans fluid as well so sort of dual purpose.
