HOW-TO replace transmission cooler lines (2007 G6 3.5L Auto) - Pontiac G6 Forum
 
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 02-04-2016, 02:17 PM Thread Starter
Junior Member
 
Join Date: Dec 2015
Posts: 6
 
HOW-TO replace transmission cooler lines (2007 G6 3.5L Auto)

Originally I posted this as a question in the maintenance forum. I've since replaced the cooler lines successfully and will describe the procedure here.

Background: Found transmission fluid leaking onto the ground directly underneath of the radiator. Removing the lower engine splash shield that is attached to the bumper revealed that the transmission cooler lines were rusted through and the fluid was pooling on top of the splash shield before leaking to the ground. This G6 had 71K miles on it during the time of the leak.

Depending on how well you know your way around the g6, the job could take anywhere between 2-4. My familiarity with the car prior to this job only included oil changes, brake pad/rotor replacement, tranny filter/pan gasket replacement, and spark plugs so it took me about 4 hours.

Replacement part was ACDelco 15212982
http://www.amazon.com/gp/product/B001UE5W9E/?tag=viglink22823-20
1. Remove the lower engine splash shield under the radiator. It's held on by 4 plastic clips and 5 screws.


2. Remove the nut securing the cooler line bracket to the transmission. Pull the bracket/lines out of the transmission and have a catch-pan ready as some fluid to come out.


3. Detach the white retainer clip holding both lines to the radiator support.


4. To access the nut connecting the lower cooler line to the radiator, remove the radiator support bracket that is directly below it. The support bracket is attached to the frame with two bolts. After removing them you can twist the bracket out of place. This can be a bit of a pain because there's a plastic panel immediately to the right of the bracket that restricts its movement. Removing a few plastic clips should help and allow you to pry the paneling back while you twist the bracket out of place. Once you've gained access to the nut, remove it while having your catch-pan ready.


5. Next you'll need to reach the nut securing the upper line to the radiator. If you remove the outlet duct you can easily reach it from the top, but to remove the nut you'll need either a crowfoot wrench or something similar that will allow you to unscrew it from the awkward angle. Since I only had regular open wrenches available, I removed the right headlight assembly to gain easy access to it.


6. Pull the old lines completely out from under the car. Next I removed the two radiator connector nuts from the old lines to reuse with the new lines. First remove the black plastic retainers by easliy prying them off. They will expose the metal retaining clips that secure the nuts to the lines. These can be removed with tweezers or a pick. Once both retainer clips are off, twist the connector nuts off of the lines.


7. Install the connector nuts onto the new lines and secure them with the existing metal retainer clips. Finally, slide the black plastic retainers over the nuts (new cooler lines should include new plastic retainers).

8. Fit the new lines into position from under the car. I installed the transmission-side bracket first, then attached white clip to the radiator support, followed by the lower radiator nut, and finally the upper nut. Be aware that when you go to screw the lower nut back into the radiator, the fitting that it threads into will give way when you press on it and fluid will drain out until you manage to fully screw the nut back in, so have the catch-pan handy.

9. Re-install any parts you removed (e.g. radiator support bracket, splash shield, etc).

10. Remove the 11mm transmission plug to get ready to check fluid level when topping off ATF (Dexron VI). Remember to top-off while the car is running.

Cheers!

2007 G6 3.5L Automatic
lexm is offline  
Sponsored Links
Advertisement
 
post #2 of 2 (permalink) Old 05-22-2017, 09:23 PM
Member
 
Join Date: Nov 2009
Posts: 34
 
Do NOT follow this How To exactly. You may possibly end up with issues trying to get things back together.

In Steps #4 and #5, do NOT remove the nuts as stated. This is important. Leave the nuts in the radiator and remove the clips that are mentioned in step #6. This is how it is meant to be removed and why the nuts are not included.

I did follow this How To to the letter, and when I went to put the nuts back in, I found that the Trans Cooler is actually free moving in the radiator, and is meant to be held on with those nuts. Mine moved back into the radiator and I had to fight for 20 minutes to finally get one of the nuts started and tightened enough to get the other started. The liquid that is mentioned in #8 is actually Coolant that flows past the Transcooler.

Aside from this, the rest of the How To worked well for me. Removing the headlight made it easier.

Last edited by jimmyfloyd; 05-23-2017 at 10:19 AM.
jimmyfloyd is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac G6 Forum > Technical Discussion & Modifications > HOW-TO

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac G6 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 for yourself.

Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
replacing transmission cooler lines (2007 g6 3.5L) lexm General Maintenance 4 09-01-2016 02:39 AM
Transmission lines rusted stumprd61 Problems and Solutions 3 08-14-2014 05:59 AM
How To: Install A Transmission Cooler CruisinG6 HOW-TO 15 06-30-2013 02:49 PM
Transmission Cooler Installed! CruisinG6 Members' Rides 0 06-24-2012 11:49 AM
2007 G6 3500 V6 Auto Transmission... Just Questions... Chris_Army_G64Dr Powertrain Performance Modifications 0 04-24-2011 01:25 PM

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

 
For the best viewing experience please update your browser to Google Chrome