Feedback Score: 0 reviews
Join Date: Jan 2011
Location: Smack in the middle of Illinois
Thanked 293 Times in 288 Posts
Unplug the fan and apply battery voltage to the motor terminals, motor will run either forward or backward depending on how connected - if you want to see it running the correct direction, connect + to the blue lead. Dark green is ground.
To test the sensor, connect one meter lead to the terminal and the other lead to the body of the sensor - suspend in water and heat the water - the resistance of the sensor will decrease as the unit heats.
To test to insure fan operation - start the engine and connect the sensor wire to ground, (the fan should run) - if the fan motor is good, but does not run with the sensor wire connected to ground while the engine is running, replace the condenser (acts as a battery). To observe the sensor operation; remove the sensor from the engine, plug the hole, fill the engine with distilled water or coolant, extend the sensor wire and connect it to the terminal, connect the sensors body with a wire to the engine (ground), start the engine, suspend the sensor in a pan of water and heat the water - just at the point the water starts to boil, the fan should come on - stopping the engine will stop the fan and removing the sensor from the hot water will stop the fan when the sensor cools.