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X5 E53 (1999 - 2006)
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  #1  
Old 11-12-2013, 02:05 PM
imbvl imbvl is offline
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Location: Palm Beach Gardens, FL
 
Join Date: Mar 2009
Posts: 14
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!

Thanks!

Bruce
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  #2  
Old 11-12-2013, 04:10 PM
HPIA4v2 HPIA4v2 is offline
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Location: washington
 
Join Date: Mar 2006
Posts: 2,126
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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  #3  
Old 11-13-2013, 04:12 AM
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Scott ZHP Scott ZHP is online now
We want the Lion!
Location: PA, USA
 
Join Date: Jul 2003
Posts: 7,534
Mein Auto: 03 ZHP, 01 X5, 73 MGB
Cold also be the thermostat in the expansion tank. It directs flow through the cooler.
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  #4  
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: 1,771
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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