Quote:
Originally Posted by rorypff
oops, I think you mean the low side aux fan (controlled by the A/C HP switch) as the high side aux fan is certainly controlled by the engine coolant temp switch.
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No ooops..time to learn some more.
The HIGH SIDE fan is controlled by the pressure of the HIGH SIDE, but it is a LOW SPEED fan
And the coolant temp of the engine controls the HIGH SPEED FAN..
You have your a/c pressure SIDES and your fan SPEEDS mixed up...
A refrigeration systems has two sides.. HIGH/LOW and that refers to the pressure of the system
The aux fan has two SPEEDS ..HIGH and LOW and that refers to how FAST/SLOW the fan motors RPM is..
To make it simple:
If the high side pressure goes up due to high thermal load conditions, the high side a/c pressure sw closes and activates the LOW SPEED AUX FAN/CIRCUIT.
,,and if the engine coolant gets to 105C due to high thermal load conditions, the coolant temp thermistor sensor activates the HIGH SPEED FAN/CIRCUIT.
That's all..