Quote:
Originally Posted by oil pan 4
This is what I have found too.
(I don't have A/C and cant comment on its use)
The Fans stay off about 99% of the time when vehicle speed is below 35mph and stay off all the time above 35mph.
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Except when pulling a grade heavily-loaded or towiing. Putting the truck to work as designed. Higher rpms and throttle fully open will find any weaknesses in the cooling system. Might be at WOT in 2nd, 3rd or other than top gear for 20-minutes or longer.
The engine fan (shroud, etc) had
better be up to snuff. The hotter the weather, the worse it is.
But it is NOT hot weather only. The need to shed heat rapidly can surprise you on some cooler days.
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