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The lack of replies is because topics like this have been discussed before. Look at the how-to articles above on how to bleed the cooling system properly and and a replacement thermostat. I'm guessing the spring portion itself on the thermostat is stuck open, causing too much flow and never letting it get warm enough while driving down the highway. Since you're not moving as fast when off the highway, the radiator is allowed to heat up again. If you're X has around 100k miles, I always suggest a complete cooling system overhaul.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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11-22-2010, 04:04 PM
Hybrid Mode
