E90 Air in coolant bleeding procedure - BMW Forum - BimmerWerkz.com

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post #1 of 1 (permalink) Old 03-25-2013, 10:07 PM Thread Starter
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E90 Air in coolant bleeding procedure

I'm preparing to replace the coolant in my E90 325i and have reviewed the procedure as outlined in the Bentley manual. The manual describes hooking up a power supply to the battery terminals in the engine compartment and causing the electric water pump to circulate coolant. I have a 12 volt, 6 amp device to energize the system but can't get the water pump to start. The procedure is to (1) hook up the power supply (2) turn on the ignition (3) turn heat to maximum and (4) depress accelerator for about ten seconds. This is supposed to start the water electric water pump. My problem, firstly, is that I can't turn the heater on. The display for heater function remains dark and doesn't respond to the controls to turn it on. I wonder if it's because my power supply is a bit lower than the 14.8 volts recommended in the Bentley manual.
Can anyone confirm that this model does have an electric water pump? Also is this procedure necessary to bleed air from the system after coolant refill? I had an E46 that I did coolant system repairs to and know how difficult it is to get all the air out of the system...however I was able to eventually do it. Can I just do the same as I previously did, that is just keep opening the bleed valve and replacing coolant as needed until all air is out of the system?
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