It will run continuously when the A/C or Defrost are on. If it is running without these being on then the thermal switch is defective.
if its not turning on then its broken.
coolant temp sensor
When a room is hot it is better to have the ceiling fan turned counter clockwise. This forces the air to blow down. In the winter the fan should turn clockwise to keep the warm air higher.
Inoperative thermostatic clutch on the cooling fan. Loose fan belts. Low coolant
if you are in a car turn on the ac or have a portable fan with you
Before you turn on a fan, the air is essentially hot because it is still and there is no circulation byconvection of the air currents. When you turn on the fan, it sparks a circulation where the hot air at the top flows to the opposite side of the room, and then eventually becomes cooler and more dense, falls to the floor, and is pushed back towards the fan by the incoming hot air. So, when you turn on the air, the fan is just cirulating hot air, not making it colder. The air only becomes cooler when it flows away from the fan.
Some of these fans will not engage until the heat sensor gets to a certain temperature. The engine needs to be hot for the fan to come on.
yes
Start the engine and drive it if possible and get it hot. Then open the hood and watch the fan turning, then turn the engine off and the fan should only turn about 2 times at the most after engine is HOT and then turned off. If it free spins several times then the fan clutch is bad. Replace clutch.
The fan will not turn on till your vehicle is at operating temperature. Check it again when the engine is hot.
Yes, because your engine is on.
It is designed to free wheel until the engine reaches running tempture. The way you check the fan clutch is make sure the engine is hot, norther words go and drive it a few miles, then come back and leave the engine running, open the hood then stand somewhere where you can see the fan turning. Then turn the engine off and the fan blades should only turn about 1 time as soon as you turn engine off. If the fan spends several times then the fan clutch is bad. Replace fan clutch. Just be sure the engine is hot when you do this test.