1989 Chevy Silverado 4x4 constantly low on tranny fluid
#1
1989 Chevy Silverado 4x4 constantly low on tranny fluid
Can not find a leak ,filled and let sit for a week. Had a big sheet of plastic under truck to see where a leak could be. Not even a drop was on it. Checked the whole under neath of the truck after every time I drove it and it is dry too. So not sure where it is going,it looses 4 quarts a week to 10 days. Anybody with ideas?
#2
I'm here for the party
have you checked out the radiator to see if theres any fluid in there?
that being said i would image 4 qts would displace some other fluids in the rad
that being said i would image 4 qts would displace some other fluids in the rad
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Rednucleus (July 12th, 2019)
#3
It's not under any pressure when not running so the leak may not show up under those conditions.
Check your cooling system for contamination from transmission fluid.
Also, while the truck is running, trace the transmission cooler lines back to the radiator and look for signs of leaks along the way.
Check your cooling system for contamination from transmission fluid.
Also, while the truck is running, trace the transmission cooler lines back to the radiator and look for signs of leaks along the way.
#4
I just did and it is fine. One thing I have noticed and is a issue too though,is my oil. I put 5 quarts in and when I drain it out in a month it has around 8 to 9 quarts in it. Which is about what is low in tranny fluid. So I was thinking there was a connection with it. But couldn't figure out how.
#5
I'm here for the party
yup, it can mix in the radiator if they both cool through it. i would fix this issue asap as oil in the trans would damage it pretty fast. ive heard of people running trans fluid in the engine to quite a noisy lifter but to me thats an old tale that shouldnt be trusted
#6
It's not under any pressure when not running so the leak may not show up under those conditions.
Check your cooling system for contamination from transmission fluid.
Also, while the truck is running, trace the transmission cooler lines back to the radiator and look for signs of leaks along the way.
Check your cooling system for contamination from transmission fluid.
Also, while the truck is running, trace the transmission cooler lines back to the radiator and look for signs of leaks along the way.
#7
yup, it can mix in the radiator if they both cool through it. i would fix this issue asap as oil in the trans would damage it pretty fast. ive heard of people running trans fluid in the engine to quite a noisy lifter but to me thats an old tale that shouldnt be trusted
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#8
Is this vehicle new to you or did it just start happening when it was previously fine?
Unless someone had previously plumbed something wrong, I don't see how transmission fluid can be getting into the oil without getting into the coolant.
The radiator has an oil cooler inside the radiator on one side and a transmission cooler inside the radiator on the other side. The two don't interconnect. If one or the other leaks, they will mix with the coolant.
Unless someone had previously plumbed something wrong, I don't see how transmission fluid can be getting into the oil without getting into the coolant.
The radiator has an oil cooler inside the radiator on one side and a transmission cooler inside the radiator on the other side. The two don't interconnect. If one or the other leaks, they will mix with the coolant.
#9
I'm here for the party
i dont see how someone would plumb up the two things when oil cooler is on one side while the trans cooler is on the other. but thats not saying someone didnt really mess with anything. and i do see your point about the two never being able to mix in the rad but thats the only thing i could think of that would happen by "accident" but then im not sure how all three even plumb up in the rad. that all being said i know some trans have a vacuum modulator and that can suck up trans fluid but his being an 89 it should have a 4l60/700r4 and those dont have one
#10
Is this vehicle new to you or did it just start happening when it was previously fine?
Unless someone had previously plumbed something wrong, I don't see how transmission fluid can be getting into the oil without getting into the coolant.
The radiator has an oil cooler inside the radiator on one side and a transmission cooler inside the radiator on the other side. The two don't interconnect. If one or the other leaks, they will mix with the coolant.
Unless someone had previously plumbed something wrong, I don't see how transmission fluid can be getting into the oil without getting into the coolant.
The radiator has an oil cooler inside the radiator on one side and a transmission cooler inside the radiator on the other side. The two don't interconnect. If one or the other leaks, they will mix with the coolant.