Quote:
Originally Posted by oldtamiyaphile
A hypermiler's radiator fan should never run.
Only time mine run is in the middle of summer with a full grill block - even then only really if towing. In normal driving the thermostats rarely even open fully.
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My engine has a water jacket on the exhaust manifold to recover extra heat and aid in warmup. While moving on level ground it doesn't come on, sure. But, Vermont is a mountainous state. Even if my radiator fan doesn't come on 95% of the time, I still want to have it for that other 5%.