Transmission Leaking at Cooler Line - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Transmission Mods

Transmission Mods Performance Transmission Modifications

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  #1  
Old 10-06-2008, 01:06 PM
agreif agreif is offline
 
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Transmission Leaking at Cooler Line

Guys,

'02 Trailblazer that has north of 150k miles on it. Wife just noticed it was shifting weird every once and a while. Checked it out and noticed it was down about a quart and a half of fluid. Checked and noticed that one of the trans cooler lines is pretty corroded on the outside. The corrosion starts right at the quick connect near the passenger wheel well and goes rearward from there. I'm thinking it's probably that seal.

Anyone had this problem before? I'm tempted to just replace the quick connect seal and see if that does it, but the amount of corrosion on the tube has me wondering if I should do the whole line too. I have a couple questions.

1. Has anyone replaced that line? I'm not sure which one is the inlet or outlet, but it looks like the procedure would be the same for both.
2. Can you replace that line without dropping the trans down? I've read that you can, but I couldn't get my hand in between the heat shielding and the trans. Maybe I just pull that shielding off?
3. How bad is it to replace that long run of a line going from that quick connect to the trans?

Timing works as I planned on a fluid change here in the near future.

Thanks,
Andrew
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  #2  
Old 10-06-2008, 03:12 PM
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blktbz blktbz is offline
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I'm not 100% what all was leaking on ours, but after noticing spots on the newly paved driveway, we brought it in today. $800 later, all the tranny lines have been replaced. So, if ours was the same as yours, I'd assume it's probably normal for these trucks.
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  #3  
Old 10-06-2008, 05:01 PM
Stoli Stoli is offline
 
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The only experience that I have with the tranny lines is when I installed a tranny cooler. I can tell you that the line that attaches to the left side of the radiator is the return line. I ended up cutting out a section of the line to insert the cooler. I don't know if it is possible to just replace the section that is corroded/leaking but it was fairly easy to cut the line with a pipe cutter. You could just add a section of rubber hose to fix the spot. The area that you said is leaking is most easily accessible if you remove the air filter and windshield washer fluid reservoir.
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Old 10-06-2008, 10:40 PM
agreif agreif is offline
 
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I wondered about a rubber line. I might try just replacing the seal at this joint:


So when in the drivers seat, the line that goes into the left side of the radiator is the tranny return line, because this is the line that connects up to the passenger line, the tranny outlet line if I understand you correctly.
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Old 10-07-2008, 08:01 PM
Stoli Stoli is offline
 
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When sitting in the drivers seat, the line that connects to the left side of the radiator is the line that sends fluid from the radiator to the tranny. The line on the right side is the line from the tranny to the radiator. In the picture below, the line that has been cut with the hose on it is the line from the left side of the radiator. I am taking the fluid that has been cooled by the radiator and I am cooling is further then sending it to the tranny.
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Old 10-07-2008, 08:05 PM
Stoli Stoli is offline
 
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I forgot the picture and it wouldn't let me edit it for some reason.

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Old 10-07-2008, 08:07 PM
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superman_79065 superman_79065 is offline
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The lines have been redesigned since 02...both lines, there is a front and rear. The redesigned lines will not connect to the original factory lines. They must be rplaced as a set. This procedure cost me over 400 dollars several years ago.....
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  #8  
Old 10-07-2008, 08:48 PM
agreif agreif is offline
 
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so to replace either the inlet or outlet lines you're telling me I have to replace the line coming from the tranny and the line from the connection point to the cooler.
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Old 10-07-2008, 08:50 PM
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Quote:
Originally Posted by agreif View Post
so to replace either the inlet or outlet lines you're telling me I have to replace the line coming from the tranny and the line from the connection point to the cooler.
yeah...it sucks
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  #10  
Old 10-07-2008, 09:33 PM
agreif agreif is offline
 
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Ugggg, I mean that one line isn't that big of a deal labor wise, but it just adds another $20 to the part cost.
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