A common fan delay relay works by a small thermal coil contained within it. Upon application of the low-voltage control signal, usually 24 v, the coil begins to heat up and after a pre-determined amount of time, will cause the primary contacts to close. This allows the furnace to fire up and warm the heat exchanger prior to the circulation fan coming on. At the end of the heating cycle, the control voltage is removed and again, after a period of time, the thermal coil will cool down, opening the primary contacts and shutting off the circulation fan. This ensures an adequate flow of air over the heat exchanger after the burner is extinguished, purging the system of any remaining heated air. Even though it may contain a thermal circuit, it essentially is still a mechanical relay and thus subject contact stick, mechanical damage, etc. Many of them have been replaced with a solid-state relay and control/ delay circuitry.
check fan relay/fan relay control module
radiator fan relay
Replace it with a good relay of the same type from another system of the car. If the fan operates properly your relay was bad. If the fan doesn't work properly, that doesn't mean your relay isn't bad, it means there is another issue.
A Volkswagen Jetta radiator fan is controlled by a fan relay. If the relay malfunctions the fan could either stay on or not work at all. An engine diagnostic would be recommended.
its a relay switch
Swap the fan relay with another like relay.
Run a hot wire to the positive wire on the radiator fan. If it works, then you have a fuse or a relay (or even a short in the wire). If it doesn't work at all, then the fan motor is bad.
could be the resistor (relay). Did the fan fail all at once or did it work on a "speed" and not others? My friend has a "Ford" and he replaced the switch AND fan motor before finding out it was the "relay" switch.
Could be the Fan Relay... Located right behind the Battery, theres a series of black boxes, all that looks the same. I believe its the 3rd black box back is the Fan Relay.
If only high speed is effected check the high speed relay and/or the fan switch/electrical connections for problems.
I am currently having similar problems with my cougar. It could be your fan relay or as it seems to be in my case your fan motor could have seized up and frozen. Unplug the fan and then try spinning the blades by hand, if they won't move you'll need a new fan motor, and most likely new relay. I have seen brand new fan assemblies go for anywhere between $75 and $120. Hope this helps.
In my '96 beretta the cooling fan relay switch is located on the drivers side strut tower. That may not be the problem. If your fan still won't work after changing the relay switch try the coolant temperature switch/sensor.