Extra cooling. For there to be an auxiliary fan there usually must be a main fan. So,the auxiliary fan does some minor cooling purposes where it's not ideal to use a large fan.
When the air conditioning is activated the auxiliary fan relay turns the fan on to maximize cooling It controls the auxiliary fan, which comes on to aid in cooling during heavy loads.
The auxiliary fan fuse can be found in the fuse box. The auxiliary fan fuse location is dependent upon the year of the vehicle. Fuse locations are usually listed on the inside cover of the fuse box.
You do not need any special tools to change out the auxiliary fan switch on a 1989 Volvo 780. The wrenches you normally use are sufficient.
on the recever drier for a/c system
Where is the electric radiator fan relay switch for a 2001 Audi A6 2.7t
The fan will physically get warmer and the blade speed will increase.
If the coolant fan does not operate on a Chevy Corsica, it is likely that a fuse is out. There could also be a mechanical defect in the fan or wiring.
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The Volt has an auxiliary battery back-up that allows the electronic door locks to still operate.
The auxiliary fan on a Mercedes is located in front of the radiator. To remove it, one should remove the wiring connection from the fan first, then unscrew the bolts holding the fan in place.