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Hey Glen,are you saying the blower doesn't work sometimes,if so then your blower motor resistor could be bad,it's located next to the blower motor,easy to remove and replace.Here's a guide to blower motor.
$24the AC light does not light until you turn the fan on, that is ok, the issue with your fan only working sometimes is more than likely a faulty blower motor, in some cases it is the switch, when the motor does not turn on try tapping it and see if that makes it work, if it does then it is the motor. the switch at autozone is part number SW295 and is $16 the motor at autozone with the blower wheel is part number PM136 cost is $24
The blower motor resistor is usually only switched into the circuit for the lower speeds and for the fastest speed the resistor is bypassed so I guess the motor needs to be replaced if it does not work in any position. However, sometimes the blower motor is not protected by a fuse but by an automatically resetting sealed circuit breaker usually located not far from the motor. The circuit breakers dont fail very often, If the fan works for a few seconds and then stops and then does the same thing several minutes later then the fan motor definitely needs replacing.