Quote:
Originally Posted by stownsen914
OK, here is my attempt to illustrate the hot and cold flow paths for the Mocal thermostat in the OP's configuration.
First up is the hot path. The paths are indicated by the arrows. Filter/engine to cooler, and cooler to tank. The bypass is blocked when warm, indicated by the red X.
Cold path - the bypass is open now. The regular straight paths are still unrestricted. The green arrow indicates the path for the OP's case when cold, instead of the 180 degree turn shown in the Mocal diagram. Nothing is blocked off when the thermostat is in the cold position. The only difference is the bypass is open, providing the "least resistance" path for the oil to follow back to the tank instead of going through the cooler. Mocal explained that some flow still does happen through the cooler when the bypass is open, but much less.
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Okay, that does make sense given the thermostat does not completely shut off the flow from the cooler.