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#1 (permalink) Old 05-29-2010, 06:49 AM
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bleeding cooling systum

hi all i need help how do i bleed my cooling system on a 1996 328is thank you
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#2 (permalink) Old 05-29-2010, 10:19 PM
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Originally Posted by stacey View Post
hi all i need help how do i bleed my cooling system on a 1996 328is thank you





10) It really helps to have a friend lend a hand by sitting in the car revving the motor and keeping an eye on the temp gauge. Start off by removing the coolant reservoir cap and the plastic bleeder screw right next to it. Fill the coolant reservoir with a 50/50 mix of coolant and distilled water. Have your friend start the car, turn on the heater to full hot on the vent position and rev the motor to about 2500 RPM, if the temp gauge goes past the 12 o'clock position, shut the motor off, let it cool down and start over again. Watch the coolant reservoir, as the engine warms up the coolant level should drop, refill as the coolant is sucked out of the reservoir. Watch the bleeder screw hole also, when coolant with no air bubbles begins to overflow then you're almost done. It's a good idea to have some paper towels handy to mop up any overflow. Screw the bleeder screw back in (be careful to not break the plastic screw) and continue to rev the motor, you should see a continuous stream of coolant spraying in to the reservoir from the small hole at the top. Continue letting that spray in to the reservoir while your friend revs the motor for a couple of minutes, until the gauge hits the 12 o'clock mark, to ensure any remaining air is gone. If the heater is blowing hot air when you're revving the motor AND when the engine is at idle then your cooling system is properly bled. If your vents are blowing cool air at idle then you still have air in the system, try revving the motor more and/or squeeze the radiator hoses to help dislodge any trapped air. Once your system is fully bled, top off the reservoir and replace the cap. Check the coolant level in a day or two and top off as needed.


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#3 (permalink) Old 05-31-2010, 05:59 AM
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One more tip that I have found helps dislodge air locked within the system is to park on a slight incline, like a drive way or ramp while you are doing the above procedure.
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#4 (permalink) Old 06-06-2010, 10:34 PM
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+1 on both answers.


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