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X5 E53 (1999 - 2006)
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Old 11-12-2013, 02:05 PM
imbvl imbvl is offline
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Location: Palm Beach Gardens, FL
Join Date: Mar 2009
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Mein Auto: BMWs: '01 X5, '03 540/6,
Transmission Heat Exchanger

I use my 4.4 X5 to pull a boat, sometimes. Not a big boat, maybe 2300 lbs., boat, motor and trailer. (With 300 hp and full-time 4-wheel drive, I have no problem pulling the boat up a slimy ramp!) If it's a hot day (here in Florida) and a long trip, the transmission refuses to shift, and I end up going down the highway in 3rd gear at 3500 RPM. Other threads lead me to believe that the transmission heat exchanger is not doing its job, and the tranny oil is overheating. Is there a DIY thread on this problem? Can I just remove it, flush it out, and replace it? It's $350 for a new one.

The tranny was replaced about two years ago, with a factory re-build, so I don't think it's a tranny problem.

I can obviously take it out, figure out the problem, take some pictures, and write a DIY thread myself, but I'd rather not invent the wheel, if I don't have to!


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Old 11-12-2013, 04:10 PM
HPIA4v2 HPIA4v2 is online now
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Location: washington
Join Date: Mar 2006
Posts: 2,782
Mein Auto: E60, E71, E92
Flush your coolant every 2-yr.
the hheat-exchanger is not the problem unless it leaks.
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Old 11-13-2013, 04:12 AM
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Scott ZHP Scott ZHP is offline
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Location: PA, USA
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Mein Auto: 03 ZHP, 01 X5, 73 MGB
Cold also be the thermostat in the expansion tank. It directs flow through the cooler.

Originally Posted by Fast Bob View Post
JUST...LOOK...UNDER...THE...CAR....for`s like checking to see if a dog is male or female....
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A bimmer with forced induction should have a proper manual gearbox. Anything less is like french kissing your sister.
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Old 11-13-2013, 03:35 PM
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boramkiv boramkiv is offline
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Location: Chesapeake, VA
Join Date: Jan 2011
Posts: 2,007
Mein Auto: Some Bavarian car outside
That thermostat for the M62 is actually on the lower right side of the radiator. The trannys are a weak spot on the 4.4i.
I've had two rebuilds, three flushes, one thermostat change. I've towed a few things in the past the heaviest being a 3600lbs car/trailer. I'm at 198,000 miles and going (although not strong).
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