1992 500SEL over heating issue.

[Wil C]

Hey, i have a 500SEL over heating. I believe the culprit is the fan driven by the engine.

I can literally stop the fan with a stick, possible my hand if i wanted to when its over heating. That's a sign that the fan clutch is gone correct? Does anyone know how this system on the 500sel works? Any experienced replacing it?

Any help much appreciated, Thanks.

[danielsatur]

A thermomatic fan clutch will engage at a certain temp, a mechanical fan clutch works all the time. The symptoms of a bad fan clutch will cause over heating at highway driving 55MPH+
What happens when you turn the heater on max, during the over heat condition?
Do you got Heat?
No Heat?
Will the temp guage go down?

[eclass]

rev engine to 1500 rpms when hot, if fan does not lock in replace it.

[sammydose]

It could be a lot of things. Faulty thermostat, faulty water pump, radiator hoses collapse, viscous clutch defective debris in the radiator ducts clogged radiator, faulty temperature sender motor can not be over-heating, etc. My problem was the viscous clutch.