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Old 02-24-2014, 07:54 PM   #5
thstone
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
Quote:
Originally Posted by ybn533 View Post
So, if I understand right than the resistors are responsible to trigger the LOW speed?
The ECU determines if the fan should be operating at high or low speed. Then the fan relays are used to route fan power through the resistor for low speed or not through the resistor for high speed.
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