Why is my radiator fan running fast?

Make sure that it is the correct sensor.

sounds like a faulty sensor

yes, the starter drive should pop out so it can engage with the flywheel teeth

temperature sensor died. replace it. located near thermostat housing

SENDING UNIT IS BAD

you have air trapped in the system.
Park facing uphill (on car ramps if you have them).
with cold engine, remove radaitor cap and fill radiator.
Fill reservoir.
leave cap on loose.
Turn on heater.
start engine and run until upper radiator hose gets hot (meaning thermostat has opened).
Check coolant level and top off. Repeat until temp gauage reads normal and heat is coming from heater ducts.

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http://autos.groups.yahoo.com/group/villagerquest/

The fan is control by a thermostat.
When the radiator reaches about 200 degree F. it should turn on.
If it do not turn on then it either the thermostat is bad or the fan.
When you turn the air condition on then the fan should also turn on.
Start with the cheap part which is the thermostat.Then work for there.

You have an air pocket in the cooling system. To bled it out you will have to park vehicle on an incline or jack up the front end untill the radiator cap is higher than the heater core. The remove radiator cap and run engine until warm then hold rpm to about 1200 rpm's and top off coolant level until you have no more bubbles.

Start with engine cool. Remove rad cap, top up coolant, start engine, & turn on heater (not defrost). let it run until up to normal operating temperature & radiator fan comes on, then shuts off. Let it do this about 3 times before you put rad cap back on & top up return bottle to proper level. Every once in a while, rev engine slightly for a few seconds while your doing it, to speed up bleed by increasing flow. Keep an eye on temperature gauge for too hot, and fan not coming on, if so, shut it off.

if you replaced the thermostat, you have an air bubble trapped in the engine. So, you don't have any coolant running through the heater core, therefore no heat.
sometimes hard to "burp" air bubble. Try this. Park park facing uphill and jack up front of car too. You want to get radiator opening higher than top of engine. Then remvoe radiator cap (cold engine), fill radiator, then fill coolant reservoir to full point. Install radiator cap but leave it loose so air can escape. Start engine until upper radiator hose going into radiator is hot. This should burp air. Repeat a few times while adding coolant mix (50/50 antifreeze) to keep radiator full. Be careful not to remove radiator cap when engine is hot.
lwt us know how ou make out. There is a more complicated procedure but you need tools and knowledge of where air bleed is on top of engine