2008 G6 Base-Adding Trans Cooler, Line Size?,Thermal bipass? - Pontiac G6 Forum
 
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post #1 of 4 (permalink) Old 08-04-2012, 08:40 AM Thread Starter
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2008 G6 Base-Adding Trans Cooler, Line Size?,Thermal bipass?

My 3.5L has 99,000 on it with no problems. I am going to do the Trans flush and oil change and am thinking of putting a cooler on while working on it because I occasionally tow with it.

It appears you can buy coolers with different sizes of hose....which size hose should I use?

Also I live in Michigan and I've read that a cooler in cold weather can cause problems until the oil warms. Should a thermal valve be installed and if so does it cause any problems with pressure or other issues if used?
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post #2 of 4 (permalink) Old 08-06-2012, 03:41 PM
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I actually went ahead and added a twin transmission cooler setup in my G6 not too long ago, Came out pretty well and well worth it! My transmission LOVES it. I wrote a HOW-TO here: https://www.g6ownersclub.com/forum/sh...ad.php?t=12261

The stock trans lines are 3/8"s at the rubber hoses (where I tapped into) All trans cooler kits come with everything you need except for the barbed fittings to tap into the vehicles trans lines..

I would say install the trans cooler AFTER the radiator so it still gets a chance to warm up in the cooler weather.

I went with two Light Duty coolers, you can do the same, or go with one, or go with a medium duty if you want.

There seem to be two different kinds...
I used this kind:
Mainly because it's still a solid 3/8" line that just passes back and forth through the cooler.

But this style cooler:

This "Stacked fin type" Is more efficient but may get it too cold IMO. So that's why I went with the less efficient style, So it cooled it but didn't over cool it haha.

But please check out that How-To and feel free to ask any questions! I'm more than willing to help out!
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post #3 of 4 (permalink) Old 08-08-2012, 07:27 PM Thread Starter
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I'm leaning to a Derale 13502 Series 8000 Plate Fin Transmission Cooler Kit; should do the job. I presume it will fit in there....7.25" x 11"????
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post #4 of 4 (permalink) Old 08-08-2012, 07:43 PM
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Oh yea there's a lot of room to fit a cooler. But room to work may be sparse. You can pull the plastic radiator cover and get a good look. Did u check out the how-to? I posted pics of the install and space.
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