The heater blower/motor doesn't blow in a/c or heat mode. when a/c is on you can feel some cool air coming out of the vent, but not fan forced. this is my daughters car, she is in another state going to school, and she doesn't know a switch from a fuse from a relay. anyone with step by step things she can check. her husband, a marine on active duty, isn't home and they do not have much money.
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Does the heater blow cold air from the vents or do you mean the there is no airflow from the vents? cold air from the dash vents when the heater control valve is set fully hot could be an air pocket in the cooling system. The radiator sits slightly lower than the engine causing air pockets to get trapped in the engine when you replace the coolant. you'll have to purge the cooling system to restore flow to the heater core. No airflow (blower motor inop) this could be a bad blower motor transistor. pin test the blower motor circuit.
Blower motor resistor is most common ($20-$70) it controls the blower motor fan and speeds or fan relay fuse (usually under the hood) If it's not either then the blower itself is bad. You can pull the motor and apply 12volts to it to test, if it spins then the resistor.
Air inlet door
Temperature blend door
Auxiliary mode door
The auxiliary A/C and heating system has the following features:
The auxiliary A/C and heating system is functional whenever the instrument panel mounted A/C control is in any position except OFF.
The auxiliary blower motor recirculates the air inside the vehicle. Outside air is not available to the auxiliary system.
Air is cooled and dehumidified by the auxiliary A/C evaporator core only if the instrument panel mounted A/C control is adjusted to a position that requires A/C compressor operation.
The temperature blend door and the auxiliary mode door are controlled by electric actuator motors.
Movement of the auxiliary temperature control between COOL and WARM causes a corresponding movement of the temperature blend door to mix air flowing through and around the auxiliary heater core.
Movement of the auxiliary mode control between PANEL and FLOOR causes a corresponding movement of the auxiliary mode door to direct air flow between the panel (headliner) registers and the floor duct.
I would say the auxiliary mode door (#4) electric motor is not wokring.
Auxiliary Blend Door Actuator —Air Distribution
Removal and Installation
Remove the RH quarter trim panel cup holder and access panel.
Remove the screws.
Disconnect the blend door actuator electrical connector.