There is heat...but it does not blow nearly as hard as it once did. I dont know but when i turn the fan on it does this....
My car did this and there was a mouse nest in the blower causing it to be off balance. Took the fan out and cleaned out the nest....all better.
SOURCE: My heater fan was making noise but was still
your blower mototr stopped turning , the noise you heard was one of the cage weights came loose and put the blower cage off ballance, first you need to locate the blower fan and check to make sure it has 12 volts, if so then you need to use a jumper wire to ground the other wire going into the blower motor, if this turns the blower motor on then you have a blower motor resister out and need to replace it.
SOURCE: Fan Blower Makes noise
Sounds like the fan needs to be replaced. But first, to check for obstructions, remove the carpet liner from the underside of the dash on the passenger side and you'll see the blower motor under the dash held in with three screws. If there's something obvious blocking it, remove it and reinstall the fan. If there's nothing blocking it, then you'll probably need to replace the fan. Any auto parts store, Rockauto.com or E-Bay will have the correct fan for your Grand Prix.
SOURCE: when i turn the heat on in my car it makes a weird noise....why
Could be the bearing in the fan motor going bad.
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