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Old 08-18-2012, 07:47 PM   #10
Registered User
Join Date: Dec 2009
Location: Connecticut
Posts: 3
My Ride: 325XI
I just had a radiator replaced (by a body shop) with a BMW OEM radiator. While driving today, the low radiator fluid light came on. Pretty quickly I noticed the temp gauge go up. I pulled over immediately, parked the car and saw a stream of fluid dump out. After I got the car towed home, I took off the bottom plastic panel and found the radiator drain plug had fallen out. It only goes in one way, so if you have trouble putting it in, turn it 180 degrees and try again. Once it is in, you will need a 22 mm wrench (I believe) and turn it 1/4 turn until it locks in place. There are tabs on the outside of the hex nut that mate against some tabs on the radiator housing that prevent it from turning further.
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