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Discussion Starter · #1 ·
Hey folks. Just thought I'd try to tap into the knowledge pool here a little. I plan on towing with my XC90 and yes it is a T6. And although your knee-jerk reaction might be to think I am crazy to do this, I have done my homework, and I am convinced that by regularly servicing the transmission, as well as doing some other preventative maintenance, that I can spare my tranny from an early death.<p>I have decided to install an aftermarket transmission cooler as well as a trans. temp gauge to help me in my effort to baby my transmission. Regarding the installation of the aftermarket cooler, I am considering by-passing the transmission cooler in the radiator. I have heard that the radiator coolers can leak into the transmission and this is one of the sources of an early death for these trannies.<p>Does anybody know if that is a rare occurrence? I prefer not to by-pass it because I prefer not to lose its cooling capacity. But if it is truly a weak link in the system, then better safe than sorry.<p>Anyways, I plan to take pics of the install. If anyone is interested I can post them here or email them out. I have already flushed the transmission and replaced the filter. That was not a bad job at all.<p>Anyway, interested in hearing your opinions.<br>Best,<br>Tony
 

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Re: Any thoughts on my weekend project: Aftermarket Trans. Cooler (tpezzolo)

I think that you would not want to bypass your radiator cooler, it provides the only cooling in times of low air flow, like when in reverse or at very low forward speeds.
 

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Re: Any thoughts on my weekend project: Aftermarket Trans. Cooler (MrTippy)

Thanks for your 2 cents. I tend to agree. The more I think about it, the more I think I do not want to by-pass it.
 

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Re: Any thoughts on my weekend project: Aftermarket Trans. Cooler (tpezzolo)

<br>It also helps to heat the trans when it is cold, more important than ya think if you live<br>in a really cold climate. (Redondo Beach isnt one of them)
 

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Re: Any thoughts on my weekend project: Aftermarket Trans. Cooler (tpezzolo)

<p>It also helps to heat the trans when it is cold, more important than ya think if you live<br>in a really cold climate.
 

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A while back I DIY'd the addition of an aux ATF cooler to the '02 S80 T6 which sports a similar OE ATF cooler as an XC90. I plumbed the new cooler in right after the OE ATF cooler in the radiator so that both work in series.<p>The new setup works perfectly well and it's abso-freaking-lutely cheap insurance against a transaxle failure in the future especially since I also changed out the original "lifetime" ATF and ATF filter. I gifted the transaxle with a fresh fill of Dexron VI ATF and should be good to go for the next 30,000 miles when I've scheduled the next ATF and filter change. I don't believe in "lifetime" ATF which is good only for the lifetime of the transaxle...which could be (and usually is) far shorter than the lifetime of the car said transaxle is installed in.<p><IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/embeer.gif" BORDER="0">
 

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Discussion Starter · #7 ·
Re: (Dextrobrick)

Do you remember the model of the cooler that you put in your S80 Dextobrick? Just curious. Yeah lifetime ATF is the stupidest thing I have ever heard of. It's just so counter-intuitive. I too am putting dexron VI in my tranny every 30,000. I plan on replacing the filter every 3 flushes.<p>We love this XC90 so much and plan to have it for years. Like you I am looking at this cooler as a little extra insurance to make sure it last for as long as we want to keep it. <p>Thanks for the post everyone. Getting excited to do the install. Plan to take pics. Will share when I'm done.<p> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/embeer.gif" BORDER="0">
 

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Discussion Starter · #8 ·
Re: (tpezzolo)

Well just a quick update on this project. I must have made 3 or 4 runs to Kragen and the hardware store to try to get all the little bits and pieces I needed. But I did complete most of the install on Sunday. I meant to take some pictures of the process, but things just got too busy.<p>The transmission cooler that I purchased, Hayden Model #679 is very slim and fits in front of the AC condenser nicely. I had to buy about 5 more feet of transmission hose. I installed the cooler in-line after the factory oil cooler and before the transmission.<p>As for the temperature gauge, the kit that I bought (B&M 80226) came with 2 brass tees (holds the sending unit) with compression fittings that were to be installed into a steel transmission line. Both tees were too small for the large lines in the volvo. I wound up removing the trans oil return line, there was a rubber section here that I cut. I installed nipples on the brass tee then clamped it into that rubber section as best I could.<p>There were a bunch of other little tweeks and things I did to make everything fit right. But all in all I am really happy with it. So far, no leaks! I have not installed the gauge yet, but will do so this weekend.<p>Given the weak transmissions in these things, it's a comforting thought to know I will be able to monitor the temp in the trans, and have a little extra cooling power.<p>Should anybody ever want to try to modify their XC90 in this way, feel free to contact me. I'd love to walk you through it.<p>Best,<br>Tony<br> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/embeer.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/embeer.gif" BORDER="0"> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/embeer.gif" BORDER="0">
 
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