Losing trans fluid, but no leaks - S-10 Forum
 
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post #1 of 14 Old 02-15-2009, 09:59 PM Thread Starter
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Losing trans fluid, but no leaks

My cousin has an 02 Blazer 4wd w/ 4l60e. Since Fall of last year he has had to put 7 qts. of trans fluid in it. He told me(he's pretty mechanically inclined) are no leaks coming from anywhere. The fluid is good and red still. Anyone have any idea what is wrong with it?



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post #2 of 14 Old 02-16-2009, 04:28 AM
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Re: Losing trans fluid, but no leaks

Check if it leaked into the transfer case. It had to have gone somewhere with that much missing fluid. I have this problem with my old 80 K10 4x4.
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post #3 of 14 Old 02-16-2009, 04:48 AM
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Re: Losing trans fluid, but no leaks

yea thats pretty crazy having to put 7 quarts in and not seeing any leaks. Like Sewrrat said has to be going somewhere.
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post #4 of 14 Old 02-16-2009, 07:55 AM
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Re: Losing trans fluid, but no leaks

Is any of it on the underbody?? maybe coming out of the tailshaft and splattering??? could be why you don't see leaks on the ground... but that is a lot of fluid
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post #5 of 14 Old 02-16-2009, 08:35 AM
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Re: Losing trans fluid, but no leaks

this might sound stupid, but does the blazer auto have a vacuum operated shift modulator? ive seen many times on the older ford explorers that they would go bad, and pull trans fluid thru the vacuum line and out the exhaust..... if so, you would usually have a film of atf on the tailgate

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post #6 of 14 Old 02-16-2009, 01:06 PM
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Re: Losing trans fluid, but no leaks

Yep do is ac/heat controls work?
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post #7 of 14 Old 02-16-2009, 01:18 PM
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Re: Losing trans fluid, but no leaks

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Originally Posted by lt1s10onair View Post
this might sound stupid, but does the blazer auto have a vacuum operated shift modulator? ive seen many times on the older ford explorers that they would go bad, and pull trans fluid thru the vacuum line and out the exhaust..... if so, you would usually have a film of atf on the tailgate
exactly what i was gonna say. it also might be leaking into the transfer case

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post #8 of 14 Old 02-16-2009, 02:44 PM Thread Starter
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Re: Losing trans fluid, but no leaks

I myself haven't looked at it, I just thought I'd see what you guys thought before I put it on the lift and everything.

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s any of it on the underbody?? maybe coming out of the tailshaft and splattering??? could be why you don't see leaks on the ground... but that is a lot of fluid
He didn't see anything on the underbody.

Quote:
this might sound stupid, but does the blazer auto have a vacuum operated shift modulator? ive seen many times on the older ford explorers that they would go bad, and pull trans fluid thru the vacuum line and out the exhaust..... if so, you would usually have a film of atf on the tailgate
I don't know if it has an vacuum operated automatic shift modulator. I don't think so because there aren't any vacuum lines going to the trans.

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Yep do is ac/heat controls work?
a/c and heat work fine.


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post #9 of 14 Old 02-16-2009, 11:06 PM
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Re: Losing trans fluid, but no leaks

Tell him to crack open the fill plug on the t-case and watch out..

I bet it's the shaft seal inbetween the tranny and the tcase...

There's no where else for the fluid to go.
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post #10 of 14 Old 02-16-2009, 11:30 PM
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Re: Losing trans fluid, but no leaks

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Originally Posted by mxthor3 View Post
Tell him to crack open the fill plug on the t-case and watch out..

I bet it's the shaft seal in between the tranny and the tcase...

There's no where else for the fluid to go.
yes...only other viable option. or the tranny fairy is stealing it.

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post #11 of 14 Old 02-16-2009, 11:44 PM Thread Starter
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Re: Losing trans fluid, but no leaks

ok thanks guys, that sounds like the problem


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post #12 of 14 Old 03-18-2009, 08:46 AM
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Re: Losing trans fluid, but no leaks

Hope I'm not being stupid but could he still have the cooler lines going to the radiator and if they are, has He checked the radiator to see if it's got any tranny fluid in it. I have seen it happen on 350 and 400 tranny's. 7 quarts is a lot of fluid.
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post #13 of 14 Old 03-18-2009, 10:59 AM
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Re: Losing trans fluid, but no leaks

it could happen....but he would be having serious problems then if he had that much atf in the cooling system

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post #14 of 14 Old 03-19-2009, 03:18 PM
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Re: Losing trans fluid, but no leaks

check your radiator. the atf oil cooler sometimes ruptures and atf goes into the cooling system since atf is under more pressure then coolant.
if its not in the transercase the radiator is the only other internal leak possible.

Last edited by t01blaze; 03-19-2009 at 03:20 PM.
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