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I will definitely try this but do you think it would make a difference? I am reading the expansion of transmission oil with heat is around 0.07% increase in volume per degree C for atf oil. That means if you have 10qts of oil at 30C, you will have appx 10.49qts at 100C. Would that really create such delay? Thanks, Ozzie |
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Google symptoms of low ATF in a ZF trans and you should find the answer to your question. |
I have read where people will slightly over fill by performing the top off at 20-25c (best to monitor temp with scanner) or lift the fill side of the transmission slightly higher by being on a sloped driveway or one notch higher on the front jack stands.
As up all night pointed out, the fluid amount is changing from about zero to maybe 100c, so 100°c difference. It's the 70° difference above the cold fill that makes the bigger volume difference. I would definitely re check the fill level while temp is about 25c |
We have the temperature at 30f (almost 0c) right now in Chicago. When I looked at the Gearbox temp with INPA, I saw 15c in the beginning before the car start. Would there be a problem with the temperature sensor or ATF fluid being warmer inside the transmission than outside is normal?
A broken temp sensor (not sure where it is located in this case) would affect the performance in any way? I am also curious if a clogged transmission cooler would somehow affect transmission itself? Sorry, I just have too many questions and I appreciate you guys sharing ideas for sure.. Thanks, Ozzie |
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Ok I just remembered the temp sensor is on the solenoid cable group and I have installed the new one with the rebuilt valve body, so it should be working fine.. Thanks, Ozzie |
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15c sounds about right for a cold transmission, even with the outside ambient temp being 0c. There's a lots of "insulation" from the cold - it would likely take days for the transmission internals to cool to near-ambient temps.
You can see this with your coolant temp too (easier to check, as it's on the cluster BC) - it's never down as low as ambient. Or mine isn't anyway... |
Possible the gearbox still a little warm from last drive? Else I would definitely look into that sensor. As Ian described the gearbox long shifts when cold. Some cold wi mornings I wonder if I'm ever getting second gear during my first few minutes of hehehe like gentle warm up the car driving
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@wpoll. 0 C has a way of sucking head out of things pretty quick.
I would not be surprised to see a 10 or 15 C difference from ambient after five or seven hours if the ambient temperature is more like 15 or 20 but it’s 0° I’d be surprised if after overnight it’s more than 5°C even know there’s a lot of space most of it is very conductive metal it’s not very insulating. That said it probably starts at temperatures cost to 120. I will see what my transmission temperature looks like compared to Ambien tomorrow morning |
The torque converter hold the bulk of the ATF and that fluid is inside the trans next to the engine. It will take quite some time for the ATF in the torque converter to give up its heat. That is why I recommend to let the car sit over night before working on it. If you have to drive the car to the garage to get on a lift the drive will most likely warm up all the ATF again.
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