Quote:
Originally Posted by David_Vasha
Keeping the good open does not affect the engine operating temp and the cooling system when idling. Yes the surrounding hot air in the engine bay will escape, but the inner components of the remain at hot enough temperatures to allow the whole cooling system to run its course/flow.
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Actually, I've found the opposite. Every 4 or 6 cylinder engine I've owned (which have been aluminum head or all-aluminum) makes too little heat while idling to even open the stat with the hood open. Too much heat shed to the environment. Just making observation, not debating the process.