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Old 05-30-2002, 09:10 AM
Posts: n/a
Just a thought - Check your viscous fan. When the temp. starts to climb - rev up the motor and see if the fan turns at full speed - if it lazily spins at higher revs - change the fan. I have changed the antifreeze several times in my 88 560sel for various reasons and never had the problems you have. Sounds like the engine is overheating from lack of cooling. Since the aux fans are working - that leaves the viscous fan as a possible suspect. Another possibility is the rad - feel the surface of the rad at different places and look for cool spots that indicate a plugged rad.One other possibility (Ihope not though) is that you have a leaking head gasket that is pressurizing the cooling system creating the air bubbles. The coolant container and cap could give problems as described but be prepared to go farther a field for the solution.
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