90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
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Radiator Cooling Fan Motor: Description and Operation
Circuit Description
The Radiator cooling system consists of a 2-speed radiator cooling tan activated by the radiator cooling fan low speed relay, radiator cooling fan
high speed relay, and the radiator cooling fan after run control unit.
Cooling Fan Speed
Controlled by:
Off
None
Low
Low speed relay or After-run control unit
High
High speed relay
Relay
Actuated by:
Low speed relay
1. Cooling fan thermoswitch
(terminal 2)
2. A/C select switch
High speed relay
1. Cooling fan thermoswitch
(terminal 1)
2. A/C refrigerant high pressure switch
WARNING: Never touch the radiator fan blades. They will rotate spontaneously when the time relay switches on the fan. Heat in the engine
compartment may cause this cycle to repeat more than once after the ignition is switched off.
