Quote:
Originally Posted by Antoin
2004 XC90 d5 auto ceases to drive once it is up to temperature.
Car will just lose drive and rev like a manual that has lost its clutch.
It has 220k on it. Gearbox never serviced in my time, probably never in it's life.
I gave it a sump dump and refill with the correct fluid. I believe I have got it to the correct levels.
It drove pretty well while I tried to get it to 80degrees to get a final level reading. As soon as it hit 70degrees box temp it lost drive. Won't engage drive or reverse. It probably will when I go back to it later once it has cooled down.
Can some explain what happens at the operating temperature that causes this?
Thanks,
Anton
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Probably because the transmission fluid is new in an old transmission, meaning its thinner than the older fluid especially when warm and its causing slippage. There's bound to be wear at 220,000 miles.
Servicing an old transmission is always a gamble. At that mileage, it was probably best left not being serviced, especially as there were no records of it ever being done before. Looks like it didn't pay off this time, sadly. It could also have been a case of the transmission having a problem that wasn't relating to the fluid, meaning even changing it would have made little difference, but you don't know that until you try.
You'd need to bring it to a gearbox specialist for a proper diagnosis. Could need a new valve body or a full rebuild. Either isn't cheap and would outweigh the value of the car. That's just being realistic.