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First, check the fuse block for an open / blown fuse. You didn't provide the make & model of your car, so you'll have to find out which fuse is used for the fan. Replace any open / blown fuse found with the correct size as determined by the manual. If it still doesn't work, keep reading:
Many cars and trucks use what is called a "resistor pack" that is used to determine various preset speeds for the heater & A/C blower or fan. When you switch the fan from one speed or another, power is passed through a different value of the resistor - which changes the voltage to the fan motor. The different voltages provides different speeds.
The resistor pack is usually the problem if the fan works at one or more - but not all speeds. It can be the problem if the fan doesn't work at all either. The location of the resistor pack varies with vehicle make and model, but is often very close to the motor itself and accessible from the passenger compartment. Consulting with a employee at an auto parts store or Chilton's (or similar) auto repair manual should get you to the right spot. Resistor packs are relatively inexpensive at about $25 or less.
Which one? there ar two fans and each fan has 2 fuses to make it work. If your fans are not working, there is NO WAY that the problem could be CAUSED by a fuse anyway. Fuses DO NOT cause electrical failures. Electrical failures cause blown fuses. If you replace the fuse and fail to correct the failure that caused the fuse to blow, it will only blow again.
It could be one of two things. I recommend checking both of them. You are correct, it could be a fuse. I would check and replace the fuse. It could also be the motor in the seat. If the fuse is replaced and it still doesn't work, your motor has gone bad and it needs to be replaced.
could be your fan relay or your temp sensor or maybe just a fuse.start with the fuses and make sure the car is up to normal operating temp cause if its not,the fan will not turn on. hope this info helps. take care and goodluck, manny