Quote
>>>*One reason an engine won't heat up properly can be related to tuning. Very late ignition timing, or an overly rich fuel mixture can also be the cause.

An engine should reach normal operating temperature in time, even without a thermostat, it is just much slower.

. ...*EB

Really? Considering the over-capacity of a cooling system that can keep an engine from overheating in 100+ degrees ambient temps, it seems likely that without a t-stat limiting the cooling, the engine could not produce enough heat at sub-freezing ambient temps to ever warm up. Am I wrong?

Dave