They are operated by thermostat electically,they shut off at a predetermined temp so steam won't develop in the cooling system when the engine isn't circulating the coolant
SOURCE: 2001 Impala Cooling Fan Not coming on ever and car
Cooling fan relay switch (in the fuse box uner the hood). Look for othger relays in there that are the same type number (they are all marked). If you find one that is the same as the cooling fan relay, then swap the two relays and check. (Turn on car and turn on A/C ... fan will start ... or not).
Fan motor could be bad (most likely).
If you remove it yourself, don't scrapr the radiator fins with the fan blades.
Hope this helps!
SOURCE: My radiator cooling fan is always running once the car heats up.
Yes, I would suspect the Thermal Relay is defective. Replace it.
SOURCE: 2001 Chevy Impala
If you have done this already,then bleed the cooling system,this is all you lack,just get the air out of the system,two bleed ports,one on the thermostat housing,and one on the engine near the water pump,just bleed them out as the car warms up,the thermostat bleeder last,if this was at all helpful,please rate,thank you.
Testimonial: "Great thanks for the info."
Hope this helps.
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