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I have a 1990 mercedes 300E. 150,000 miles. 300ci 6 cyclinder. There is a coolant leak on the drivers side coming down the side of the motor. I cant see exactly where it starts because the intake manifold is in the way. I can see it coming from above the motor block freeze plug, not the plug itself. The car runs normal. No smoke or coolant coming from the exhaust. Oil is ok. It does not overheat. The temp gauge is normal.