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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 04-25-2014, 08:37 PM   #1
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Join Date: Sep 2012
Location: Baltimore, MD
Posts: 2
My Ride: 2004 330ci ZHP
Cooling Overhaul, now no heat

Hi- New to this forum. I have a 2004 330ci ZHP. I just did a complete cooling system overhaul, to include stewart pump, theromastat, radiator, exp tank, hoses, tensioners and belts. I added BMW antifreez-- it took just over 2 gals-- and I bled in per the bently manual-- however, I did not remove the bleeder screw, or let it run out of the bleeder for very long.

The car temp guage is reading right in the middle when I warm up the car-- just parked. I have not run it on the road yet. Even with the car warm, and temp turned up to 91-- I am not getting any heat.

Should a bleed the system again, and let more run out of the bleeder screw?



Last edited by dcwweb; 04-25-2014 at 08:38 PM.
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Old 04-26-2014, 08:39 AM   #2
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Join Date: Jul 2008
Location: USA
Posts: 1,104
My Ride: 2001 330Ci
You need to set the HVAC controls to 91 degrees and manually set the fan to the lowest setting when bleeding the cooling system. Otherwise, air can be trapped in the heating system.

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Old 04-30-2014, 01:31 AM   #3
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Join Date: Jul 2006
Location: Calgary, AB
Posts: 232
My Ride: 00 E46, 05 E46
Had the same issue, air trapped in system. Bleed air our with the bleeder screw first (thermostat set to full heat), go for a cruise to ensure engine is hot. Let cool and refill coolant tank to appropriate level. Should have heat by then.
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Old 04-30-2014, 07:55 AM   #4
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Location: houston, tx
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My Ride: 2002 330i
yup bleed the system...as other have said air is in the system.
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Old 05-01-2014, 11:12 AM   #5
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Location: San Jacinto, CA
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I also found it very helpful to drive the front onto ramps. The extra elevation of the bleed screw over the rest of the system made getting a complete bleed much easier.
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