Temp blend door actuator malfunction.
what is the car make and model? I have seen many questions on Olds Intrigue. 2002 Pontiac grand prix
93 grand am... that's a Pontiac product. Burn it!
vacuum line from intake manifold to control unit in dash broken or disconnected
blower motor resistor
Typically a relay or resistor. But could be a blower switch or blower motor problem.
Your average A/C unit blows heat through all vents.
your fuse is blown. car manufacturerers make the dash lights go off when the tail light fuse blows so you know it is blown.
sounds like your water pump ain't pumping, don't drive it till it is!. could be as simple as a new fan bewlt or might even need a pump
Dissconnect the battery for 1 hour and reconnect, should re-set the flaps!
heater core could be plugged, also check for low coolant
When my a/c system is low on refrigerant, it blows hot on drivers side, cold on passenger side of the dashboard. This is a 1997 Buick Ultra. Recharging the system solves the problem.