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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 03-25-2012, 09:15 PM   #1
SLVM3
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Join Date: Oct 2011
Location: Chicago IL
Posts: 3
My Ride: 2003 M3
Unhappy Please Help Need Advice :/

Hello I am new to this form and actually new to the bmw ownership. Just about 6 months ago I bought a 2003 BMW m3 with 38k miles it currently has 43k and its overheating the problem happened last week it just started overheating out of no where. What i have already tried bleeding and flushing the system. I removed the thermostat and replaced the fan clutch. still no luck while idling it wont overheat but as soon as you start driving it immediately spikes up. Any ideas ? Head-gasket ? Any help would be greatly appreciated Thanks
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Old 03-25-2012, 11:59 PM   #2
Bnutz29
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Join Date: Apr 2011
Location: Ma
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My Ride: 04' 325ci
Belt tensioner.... My thought is water pump not pumping hard enough. If no leaks or air pockets and no thermostat not much left to look at.
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Old 03-26-2012, 06:31 PM   #3
SLVM3
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Well the belt has pretty good tension. Is it common ?
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Old 03-26-2012, 06:37 PM   #4
Bnutz29
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It's common but if it seems good it prob is good.
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Old 03-26-2012, 07:00 PM   #5
Bnutz29
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I would try bleeding again, make sure u turn heat up all the way to make sure heater core opens up
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