Fan Won't Stop

[Oka]

The XC70 2001 has been sitting for a few now. I need to run it as a spare car while I am fixing something in the Subaru. I charged the battery and started it. However, a fan will not stop running. The fan seem to be behind the passenger side dash, more of inside the engine compartment. I know sometimes the cooling system fan tend to run and stop, when I use the AC in the summer. The location of this fan is different. I thought it would stop as usual, but it did not, it kept going.

I had to mix a gallon coolant to the 50/50 ratio. The time it took me to mix the concentrated coolant, check the guage 50/50 level, pour the mixture in two gallon container, the fan was still running. I just had to unplug the battery.

What's going on here?

Cheers

[br0dy]

are you sure it's the fan? When my vacuum pump switch broke I thought it was a fan running too.

HVAC blower motor is behind glovebox.

[Astro14]

This happened to me once, years ago - radiator fan would not shut off.

Open the hood. See if it is running.

If it is the radiator fan that is running, then unplug it before it kills the battery. Because it will completely discharge the battery.

The fault is internal to the fan control module. The fan module has a big 12v power input, a big ground input and two wires from the ECM that control fan speed via PWM.

The fix is an entirely new fan. The module is available separately, according to FCP Euro, but they cost about as much as an all new fan.

Volvo OEM fans are crazy expensive. My car has been running a TYC fan for several years.

Shop around - Rock Auto lists the fan for a good price, but a different part number. FCP wants twice as much. But I?m sure they have the correct part number. I got mine from FCP, which also has a lifetime warranty on parts.