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Wiring Harness R53
by Scm68
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Old 11-06-2007, 02:20 PM
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How to Remove Air From Cooling System?

I know on the R53's there was a valve by the thermostat, but how does one bleed any air from the cooling system in an R56?
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Old 11-09-2007, 11:56 AM
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Originally Posted by joshK View Post
I know on the R53's there was a valve by the thermostat, but how does one bleed any air from the cooling system in an R56?
Run the engine with the radiator cover off, it should burb the system. If there is not rad cap, i never looked. You have to fill it from the expansion tank, which is hassel. run the car with the expansion tank open it will purge it'self.
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Old 11-09-2007, 12:08 PM
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This diagram shows a vent screw (#8) in the thermostat housing:
http://www.realoem.com/bmw/showparts...31&hg=11&fg=35
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Old 11-11-2007, 07:18 AM
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Another way to do it is turn the temp control to max heat and run the fan on high. The air bubbles will pass through the heater core and vent through the system.

Hope this helps
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Old 12-19-2007, 06:08 PM
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You probably have worked it out but you access the bleed screw by the large connector on the thermostat housing. Put the fan and heat on HI.

I just had my rad replaced after a deer encounter but they failed to reconnect the top hose and my trip home ended in a cloud of steam... and I'm a bit steamed. Tomorrow will reveal if there was damage. no temp light but I think the sensor is in the thermostat housing and that would have been reading air. They apparently removed the hose to bleed air out of the heater. Regretting trading my 03 for an R56...
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Old 12-31-2007, 06:15 AM
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Thanks for notifying us of the location of the vent screw, th3118. I found it on mine, but would like to know the actual procedure for bleeding the air from the system using this vent screw. Do I do it while the engine is running? Should I have the cap on the expansion tank or off? If anyone knows the exact procedure to do this correctly I'll be very grateful. Thanks in advance.
Definitely wouldnt remove that plug while the engine is running. I would run the engine for a few secs with the rad cap off then shut off and bleed . Repeat until no more air comes out. R56 engines heat up fast so be carefull
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Old 12-31-2007, 06:15 AM
 
 
 
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