Electric Fans Not Turning On

rbreith · Jul 20, 2014

I installed electric fans into my 89 mustang with the probe thermo sensor in the bottom of the radiator near the outlet to the engine. I ran the car and it just got really hot without the fans ever turning on. I have the switch set to turn on at 180 degrees right now to check it and its not working. I however know that the wiring is correct due to the fact that I also wired it for manual on with a switch and it works fine. do I need to move the thermo sensor and if so where. Also how good do the probe in radiator sensors work vs a thread in

Shakerhood · Jul 20, 2014

I prefer the threaded sensor, you should move your push in probe up over near the upper hose.

mikestang63 · Jul 21, 2014

The probe should be installed about an inch below the upper radiator hose. To test the fan, you can either turn on the A/C if you installed the A/C bypass wire or bridge the temp sensor connections with a wire. What controller are you using?

rbreith · Jul 21, 2014

Derale Performance Single Stage Fan Controllers 16738 off of summit racing

rbreith · Jul 21, 2014

planning to change the fan on to 205 and off at 190. with a 195 degree thermostat

rbreith · Jul 21, 2014

well may be going with 185 on 170 off with a 180 degree thermostat what do you all think

jrichker · Jul 22, 2014

mikestang63 said:
The probe should be installed about an inch below the upper radiator hose. To test the fan, you can either turn on the A/C if you installed the A/C bypass wire or bridge the temp sensor connections with a wire. What controller are you using?

That may work for a switch type sensor, it depends on if it trips open or closed when it reaches the set point.
It won't work for a thermistor like the ECT or water temp gauge sender..
Some time spent with the sensor connected only to a heat source and ohmmeter will be needed to determine what type of sensor is being used.

rbreith · Jul 22, 2014

im gonna say im using a switch type sensor since it has a power wire going to it from a ignition 12v then to the relay

jrichker · Jul 23, 2014

rbreith said:
im gonna say im using a switch type sensor since it has a power wire going to it from a ignition 12v then to the relay

Sounds right to me...

stangr5oh · Jul 23, 2014

I agree putting the switch just below the top hose to receive a more accurate temp reading vs a reading from the bottom of radiator as the water temp is lesser I would presume since the radiator is designed to cool water.

Micheal Nadeau · Jul 28, 2014

Did this happen right after the e-fan install? Is it possible there is a wiring issue?

FoxMustangLvr · Jul 29, 2014

x4 on moving the probe. People have had good success with push in probe type sensors when installed correctly while there's no doubt the thread in is better. Set the fan to come on at a cooler temp until you get it all dialed in.

Electric Fans Not Turning On

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