Electric Fan Sending Unit Not Working

Disconnect the grey wire from the sending unit and touch it to ground with the key on engine not running.

Electric fan sending unit not working.

Refer to your vehicle repair manual to locate wires components and modules if necessary. If you are unsure which wire is which coming out of the electric fan find the fan manufacturer s supplied wiring diagram. If the fan runs the sending unit is bad or not getting a ground too much teflon tape if it doesn t run. The switch is designed to be on or off depending on the temp of the engine.

If it clicks get a voltmeter or test light and check for battery power at the fuse and relay yellow wire. Pull the fan s electrical cord out to keep it from turning on randomly while you re working on it. Listen for the relay clicking. Assuming you have the typical 30 amp relay.

You want to the battery hooked up to terminal 30 the fan motor hot lead hooked up to terminal 87 and then a 12v switched ignition source to 85 and the temp switch hooked up to 86. You would need two temp ports and two senders. Or on at 195 f. This problem occurs when the thermostat is set too low below room temperature preventing it from turning on.

Depending on the model the thermostat sending unit triggers the fan on at 185 f. Unplug the fan and either unhook the blade guard or unscrew the pin. At this time there is not a sender switch that can be programmed this way. Grey wire is connected to the thermostat sending unit terminal with the blue ring crimp connector provided.

The summit 890117 electric fan thermostat switch will not work with a gauge. And off at 165 f. Feel around the sides of the blade guards for clips that are holding the 2 parts together. The temperature probe should be plugged into the system where the coolant is hottest generally the thermostat housing in the coolant passages adjacent to it or in the water jacket of the.

In certain cases an electric fireplace s flame flickers and the fan blows but no heat is produced. Unit does not supply heat you may have to replace the heat switch. A toggle switch can be wired into the system to manually override the cycling of the fan. And off at 175 f.

If you re still not sure once you ve completed all the wiring let the. Still in some cases you need to make a diagnosis using a professional scan tool to check for voltage values and power inputs to the cooling fan to locate the source of the problem. Summit racing answer february 25 2019.