Up to 4 months before it stopped, whenever i turned on the heater , a/c, or just the fan it was very loud, sounded like it was having trouble working. trying to figure out what parts to check before trying to pull the whole thing apart.
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I would check the fan motor for the heater sounds like the bearing is going out. Does it scream and then go quite or rumble if so it is probably the heater fan. It will run and blow air but it will make a lot of weird noises. If you shut the fan off and the noise goes away it is the fan.
you say that you feel air but it isnt forceful. the answer is your ac/heater blower motor resistor. it is located under the pass side glove box and the blower motor is a big black cylinder and right behind it on the left is the resistor. take that out. got to autozone and pick one up for 25$.
mcdevito75 here, The heater/Ac fan motor is a sealed unit, locate the fan motor, as you look at the engine from the front of the car the fan motor will be on your left side comming out of the firewall, It"s a round cylinder like and is black, from inside the car put the fan on, tap the fan motor itself with a screwdriver, small wrench, etc. see if it"ll start, if not have your local shop replace this fan motor.
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.
Most likely it does, if you can hit the motor and it will run. I can't say for sure but you might want to chk. to see if you got a heater blower motor resister. There located (if its got one) around the heater motor and it controls blower speeds, might be worth checking out.