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It sound like the heat and AC dash switch control unit has developed a short and effectively fused some contacts together.
The danger is that electrical shorts have the possibility of starting a fire.
The electrical circuit can be disconnected by removing the heater and AC fuses from the fuse box.
Check to see if the blower works with the heater on. Turn the control to heat and see if the fan works. First check the fuse for the blower. If the fuse is good and the blower does not work with heat on , the blower may be bad or the speed resistor maybe bad.
check the fan itself to see if it works. check the heater fuse first! if all is ok, you probably have a bad heater fan resistor. to check blower, please go here on pc for info on blower. .cargurus.com/Cars/Discussion-t16272_ds569146
there are a few things that will cause this problem.
1. it could be the heater fan fuse
2. could be the heater fan motor itself
3, a bad switch or relay
check the fuse and then check for voltage at the heater motor itself, if you have voltage at the heater motor,, give the heater motor box a love tap with your hand and see if it starts to turn, if it does not turn or even if it does ( after tapping it ) - it is time to replace the heater motor.
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.
WELL TURN ON AC MAX COLD HIGH TO SEE IF COOLANT FANS TURN ON.IF NOT YOUR REFRIGERANT SO LOW THAT THE AC REFRIGERANT PRESSURE SENSOR WONT CLOSE CIRCUIT TO TURN ON COOLING FANS.MEANING YOU NEED HAVE AC CHECKED AND CHARGED.ALSO CHECK COMPRESSOR FOR POWER IF NOT YOU HAVE BLOWED FUSE OR BAD RELAY.IF FUSE AND RELAY GOOD YOUR AC COMPRESSOR CLUTCH COIL OPEN OR THE AC CONTROL SWITCH IS BAD.IF COMPRESSOR IS RUNNING WHEN YOU TURN ON AC YOUR AIR TEMPERATURE ACTUATOR NOT WORKING.