Have 97 grand prix and no heat blows out of vents. Tried replacing heater blower, resaiance switch, fan control switch only works on number five and still no heat.Also tried changing fuse have had four different mechanice and still not fixed. Someone said find out where heater box is and check that area for air vent not closing. Can't find out where heater box can someone tell me?

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Either the fan motor is bad, something is jammed in the motor housing, a/c fan relay is bad, or the cluster that controls the climate control is unplugged or bad.

Open the hood and with the heater running(be careful PLEASE), feel the lines going to the heater core(2 hoses running to the firewall, to the blower motor). Is one of them hot? If both are cool, your relay valve to allow coolant to the heater core is stuck. It will have to be replaced. Is the blower fan running( that's the fan in front of the firewall)? If the valve opens but no fan running, you will not get hardly any heat. If all that is working, You have a problem with the vent control valve(that will open the hose duct to allow heat to go through the vents). It works off of vacuum. A hose may have broken (they are made of rubber), or it may be just stuck. Check these first, before looking at the heater core. I hope this helps you

check your blower hoses to see if one or more have come loose or got redirected or the selector switch isn't functioning properly (is it blowing better on defrost as opposed to floor vents, or forward vents, etc.)
Good luck

Go to Autozone.com and enter 2001 Pontiac Grand Prix in the repair info area and you will be able to view an online Chilton' s manual for free. Good Luck!

for the fan blower motor it could be the resistor or the fan control speed control switch is bad.for no lights replace the DRL RELAY for the lights. for the heated seats check the fuses.

i have the same problem on my 84 grand prix..ther is black wire that heat runs through i broke my cause it was so old an dry rotted an the heat stoped coming out the vents but comes through the dash by the winshield

you may try replacing the heater resistor block... that controls the different speeds of the motor and may be defective. (they rust). if you look at the duct work near the fan you will see a part with a wires going to it with two or threes that hold it in... remove that and inspect it. be careful. when the fan is going that resister combination gets very hot.

Robert

Is # 5 the high setting ? if so then you blower motor resistor is bad

I would suggest replacing the blower motor resistor. When this component fails the blower will only work on one spped or none. This is a very common issue with all automotive models