Hey thank you all,What I'm trying to do is pervent my head from ever getting to hot,as you know the m104 engine eats headgaskets.I believe if I lower operating temps it will last longer.So far 180,000 miles no gasket,could be because of my 168f thermostat,I'd also like to know if a S500 fan would fit my engine,they have more blades.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran