Cooling System

[DAK]

Just think about this for a minute. The radiator fan normally kicks in
when the car is not moving. So when you are running, the thermostat is
what regulates coolant flow through the radiator(s) and tries to keep
the coolant in a certain temp range. Using a lower temp thermostat will
lower the running coolant temp.

David

Mike Del Tergo wrote:

> the engine is at operating temp the thermostat is wide open either way.  My
> guess is that the rad temp switch would have a bigger impact on "running"
> temps.