2000 BMW 740

Engine Cooling problem
2000 BMW 740 V8 Two Wheel Drive Automatic 130000 miles

i just replaced the plastic screw in front of the radiator cap, it had faultered and steam was coming out causing the computer to tell me to check coolant. Once the screw was replaced I still get the check coolant message and it seems as though the fan is running very loud. I have been checking for leaks in the garage and nothing.
August 11, 2010.

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