Engine Cooling Fan
The engine cooling fan provides additional air flow through the radiator to aid in reducing the temperature of hot coolant as it flows through the cooling system. The fans are commanded on and off by the engine’s processor.
Pulley driven cooling fans utilize temperature-sensitive "couplings" to speed at startup in order to provide more fan engagement as the temperature increases.
Related Questions
See what others have asked about this, or visit the Questions page to ask your own question.
Fan won't spin car smoking by reservoir
The cooling fans on my 1998 w163, ml320 work part of the time. pulling the fuse and replacing after a few seconds...