Please direct all technical questions to our Derale tech line at (323) 266-3850
Warning: Installation of accessories should only be undertaken by those with mechanical knowledge and are familiar with working on
vehicles. Always use eye protection (goggles, safety glasses or shield). Park the vehicle in a well lit area, on level ground and apply the
parking brake. Only work on a cold vehicle that has been sitting overnight, failure to do so will result in severe burns and injury. Before starting
the vehicle, make sure no tools or any other items are left under hood that could interfere with or be drawn into moving parts of the engine.
Failure to follow instructions can lead to severe damage and personal injury.
Derale Performance, Los Angeles, 800.421.6288 www.derale.comCADerale Performance, Los Angeles, 323.266.3850 www.derale.comCA
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SENSOR TEST: Disconnect the two sensor wires from the fan controller.
Set the multimeter to: Ohms (200K). If you have an auto select multimeter, please manually set the meter to 200K.
IMPORTANT: This test should only be done after the vehicle has cooled off and has been sitting for a few hours.
Black Lead: Connect to the black sensor wire
Connect to the red sensor wireRed Lead:
A. If the ambient temperature is around 65° F, the meter should read close to 125K ohms
B. If the ambient temperature is around 75° F, the meter should read close to 100K ohms
C. If the ambient temperature is around 85° F, the meter should read close to 80K ohms
D. if the sensor reads 0K Ohms, the sensor is bad and must be replaced, please contact our tech team.
SYMPTOM: Fan(s) are squealing or making a squeaking noise at startup.
TEST: Re-verify that the battery terminal on the fan controller has a minimum of 12.6 volts. See tests 1 and 2 on previous page.
NOTE: If the vehicles battery is located more than 5 feet from the fan controller, the signal could be encountering some
interference or noise, which causes a dirty signal. In some cases an additional electrical filter may be required. Please contact
our technical support team for more information. (323) 266-3850 or dp_tech@derale.com .
ADJUSTING THE FAN CONTROLLER TO ITS LOWEST SETPOINT: Remove the rubber plug from the top of the fan
controller and turn the potentiometer screw 25 FULL turns counter-clockwise. This will set your controller to its lowest set point.
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