Thread: W123 300D Does the Coolant Thermostat Orientation Really Matter?
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Old 03-30-2021, 10:23 AM
t walgamuth's Avatar
t walgamuth t walgamuth is offline
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Join Date: Apr 2005
Location: Lafayette Indiana
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There is a spring that actuates the valve. It is on one side of the stat and not on the other. The spring is supposed to be on the hot side so it will open at the temp needed. IOW yes, emphatically it matters.

The diversion stat used in most benzes is even more important since when it is open it channels water to the radiator and if closed the water goes directly to the head to get the engine up to temp. faster.

Things in a car are all parts of systems. Use them as designed for best performance.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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