overheating!
 

2007 E70 X5 3.0SI

So I was in the carwash yesterday 1 week after buying my X5 and all the sudden all of the windows fog up and hot air is coming out of all the vents. after I got out I was leaving and the car chimed and the display said car is overheating drive at higher speeds to cool it down. Then after that it said the engine overheated and to pull over and turn it off. Also it was in limp mode.

I don't think the aux fan is turning on. If I drive at a good speed the temperature of the engine drops. if I let the car sit idling with the A/C on the fan never turns on and the car heats up, I don't let the temp go above 105C before I turn it off. Does the fan have a fuse or relay?

Thank You!!,
Tyler

your water pump has failed. DO NOT KEEP DRIVING.

Do a search, lots of reports on this.

I think the water pump is working fine, the way I tested that was the bleeding process, as it runs the pump for 12 mins and there was water flowing. I'll upload a video of the water pump running with the motor on and without it on.

Water pump running with motor running

http://vid1175.photobucket.com/album...psr9c7mpfx.mp4

water pump in the 12 minute flush mode


http://vid1175.photobucket.com/album...psxqzqtkob.mp4

Just had my water pump fail and the telltale sign for me was the radiator fan went into overdrive (even immediately after a cold start) and it was extremely loud. The thermostat was checked out ok and read the high temp properly. Maybe it's your thermostat on the fritz. Do you hear the radiator fan operating normally at all?

normally I would put the water pump first but my radiator fan never comes on.

^ edited to say i do think it's your thermostat given that your fan isn't acting properly.

I wish I could find a proper way to test the fan. I fed it 12 volts but it has some kind of control wire most likely for PWM. Anyone ever test one of these newer style fans?