Cooling fan won't kick on

[LDipset]

Check the fan motor and the relay, both are good. Where is the next place to start?

 

[Avant Uprising]

Coolant temp sensor

Sent from my LS670 using Tapatalk

 

[JohnS.]

Is your car warming up properly? Have you tested the fan switch? Checked the fuses?

 

[LDipset]

fuse is fine, where how do i go about checking the fan switch? or coolant temp censor?

 

[98exD15b]

I belive the cooling fan temp switch is on the thermostat housing, and the engine temp sending unit (temp gauge) is just below that. im having the same issue, cooling fans wont come on

 

[dieselbacon]

Fan Switch:
On the thermostat housing there is a sensor/switch that controls the fan. At the engine side of the lower radiator hose (comes from he bottom of the rad) there is the thermostat housing with a fairly large sensor/switch that screws into it. If the wiring looks good, fuses and relays are good and the fan is good. You can try replacing or testing the sensor. Most sensors/switches can be tested with a muliti-meter. You would have to research the correct testing procedure, probably found in a repair manual for the car.

Temp gauge:
Theres a seperate sensor below the distributor that looks like the end of a spark plug (a brass nipple more or less) that sends a signal to the temp gauge in the car. A wire with a boot covers it when its pluged in so you wont see the end of the sensor when its pluged in. Its a bugger to get at!

 

[RonJ]

Unplug the 2P connector to the fan switch on the thermostat housing. Short the two terminals in the connector with a jumper wire. Turn the key to ON(II). Does the fan now run?