Losing trans fluid, but no leaks - S-10 Forum
S-10 Forum is the resource on GM S-series trucks, Suspension, engine information, Body Modifications, painting tutorials.  Modifications to suit every need, budget and whim

Losing trans fluid, but no leaks

Go Back   S-10 Forum > Engine and Drivetrain Tech > Transmission & Rearend
New User? Register Forgot Password


 
LinkBack Thread Tools
Old 02-15-2009, 10:59 PM   #1
▂ ▃ ▅ ▆ █ ▆ ▅ ▃ ▂
 
ZQ8 Blazer's Avatar

 
Age: 31
Join Date: Jul 2004
Posts: 30,317
Location: Western, Ky
User is: OffLine
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?
Sponsored Links
Advertisement
 
Old 02-16-2009, 05:28 AM   #2
Registered User
 
sewerrat's Avatar
 
Join Date: Dec 2007
Posts: 400
Location: Maui
User is: OffLine
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.
Old 02-16-2009, 05:48 AM   #3
Registered User
 
customchevys's Avatar
 
Join Date: Dec 2007
Posts: 907
Location:
User is: OffLine
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.
Old 02-16-2009, 08:55 AM   #4
Killing Time
 
Petro's Avatar
 
Age: 29
Join Date: Oct 2008
Posts: 5,285
Location: Huntsville , AL
User is: Online
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
Old 02-16-2009, 09:35 AM   #5
Local Tech
 
ls1s10onair's Avatar
 
Age: 31
Join Date: Jan 2008
Posts: 5,137
Location: Emerson, NJ
User is: OffLine
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
Old 02-16-2009, 02:06 PM   #6
Registered User
 
Age: 27
Join Date: May 2007
Posts: 1,271
Location:
User is: OffLine
Re: Losing trans fluid, but no leaks

Yep do is ac/heat controls work?
Old 02-16-2009, 02:18 PM   #7
Overhead Console Expert
 
Raven's Avatar
 
Age: 27
Join Date: Jan 2008
Posts: 1,884
Location: Omaha, Nebraska
User is: OffLine
Re: Losing trans fluid, but no leaks

Quote: Originally Posted by lt1s10onair
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
Old 02-16-2009, 03:44 PM   #8
▂ ▃ ▅ ▆ █ ▆ ▅ ▃ ▂
 
ZQ8 Blazer's Avatar

 
Age: 31
Join Date: Jul 2004
Posts: 30,317
Location: Western, Ky
User is: OffLine
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.

Quote:
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.

Quote:
Yep do is ac/heat controls work?
a/c and heat work fine.
Old 02-17-2009, 12:06 AM   #9
Registered User
 
mxthor3's Avatar
 
Join Date: Feb 2009
Posts: 5
Location:
User is: OffLine
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.
Old 02-17-2009, 12:30 AM   #10
Overhead Console Expert
 
Raven's Avatar
 
Age: 27
Join Date: Jan 2008
Posts: 1,884
Location: Omaha, Nebraska
User is: OffLine
Re: Losing trans fluid, but no leaks

Quote: Originally Posted by mxthor3
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.
Old 02-17-2009, 12:44 AM   #11
▂ ▃ ▅ ▆ █ ▆ ▅ ▃ ▂
 
ZQ8 Blazer's Avatar

 
Age: 31
Join Date: Jul 2004
Posts: 30,317
Location: Western, Ky
User is: OffLine
Re: Losing trans fluid, but no leaks

ok thanks guys, that sounds like the problem
Old 03-18-2009, 09:46 AM   #12
Registered User
 
halfbreed's Avatar
 
Join Date: Feb 2009
Posts: 13
Location: Grand Valley
User is: OffLine
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.
Old 03-18-2009, 11:59 AM   #13
Overhead Console Expert
 
Raven's Avatar
 
Age: 27
Join Date: Jan 2008
Posts: 1,884
Location: Omaha, Nebraska
User is: OffLine
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
Old 03-19-2009, 04:18 PM   #14
rollin' on 33's
 
t01blaze's Avatar
 
Join Date: Mar 2009
Posts: 917
Location: South Jersey
User is: OffLine
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 04:20 PM.
Sponsored Links
Advertisement
 

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the S-10 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 11:30 PM.

Powered by vBulletin® Copyright ©2000 - 2011, Jelsoft Enterprises Ltd. SEO by vBSEO 3.2.0
SEO by vBSEO
vBulletin Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.