Ambient air approximately 60-70 degrees F. However, I remember the temperature rising to normal even in 0 degree F weather (eventually). The engine shows no signs of overheating (loss of power, etc.) even after long, slow dirt road hill climbs.
Temperature checked at top of radiator.
The primary crankshaft cooling fan runs as normal with engine on, and the auxilary electric fan does not come on with ignition on/engine off.
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