Cant get def. to blow warm air,floor air works good

There should be three. Temp control, fresh air, and vent direction.

Sounds like the blend door or blend motor is not functioning/opening. This door allows the heat/cold air to come in by adjusting open, closed or anywhere in-between for temp. Start there. They are usually vacuum controlled and mounted under the front dashboard near the knee board.

Does your vehicle have manual or automatic climate control ? You system is stuck in floor an defrost mode ?

Item Part Number Description 1 18A318 Vacuum control motor-floor/defrost door 2 - Defrost air flow 3 18A478 Floor/defrost door 4 18476 Heater core 5 19860 Evaporator core 6 19805 Blower motor 7 - Outside air inlet 8 19A813 Air inlet door 9 18A318 Vacuum control motor-air inlet door 10 - Recirculated air inlet 11 18B545 Temperature blend door 12 18A559 Panel door 13 - Panel air flow 14 18A318 Vacuum control motor-panel door 15 - Floor air flow 16 - Vacuum from the engine intake manifold 17 19A563 A/C vacuum check valve 18 19A566 Vacuum reservoir tank and bracket 19 19980 EATC control
Pull the control panel an check for vacuum

Item Part Number Description 1 White Air inlet door 2 Yellow Floor/defrost door 3 Red Floor door 4 Blue Panel door 5 Black Source vacuum 6 - Not used


VACUUM APPLICATIONS CHART-ELECTRONIC AUTOMATIC TEMPERATURE CONTROL Switch Port Vacuum Harness Hose Color Func- tion Manual Override Selector Buttons OFF MAX A/C NORM A/C VENT FLOOR FLOOR/ DEF DEF 1 White Air inlet 2 Yellow Floor/ panel (partial) 3 Red Full floor 4 Blue Panel 5 Black
Source

the problem is more than likly a vacuum leak. look under the hood on the emissions lable and find the vac line that goes to the HVAC system. if you se the leak there great otherwise unless you work in an auto shop like me what i have done is smoked a cig and blew in the line to find the leak. the smoke will escape where the leak is...

iwould check the selector motor,and also replace the thermostant,start with the stant first,the selector motor is what runs the door for hot or cold the motor is a common problem,if the temp gauge is showing a quick warm up temp then its the selector motor, if it takes a while to reach operating temp then replace the t-stant,also make sure the coolant is full in radiator,check when cold or warm,dont open when hot, hope this is helpful.

If the vehicle has dual zone climate control, either the air mix door is broken or the motor that controls it is broken. It may also have the vacuum control system, which could mean a loose vac line or a broken diaphram. If its not a dual zone, then the air should be the same temp both sides as the mix door is one piece. It sounds like a mode door controller is bad, either case.

If you are mechanically inclined..you can fix it..the A/C and heater air is directed to different places by the doors in the duct work..and these door are actuated by vacuum..and you might have a hole in a vac line or the vac line came off of a diaphram or a diaphram has went bad..the duct wor could have come apart or the heat/A/C module has went bad..but most of the dash will have to be taken apart to get to the duct work..i hope this will help..if not..write me back

You are experiencing a warm air blend door problem, possibility cased by a week vacumn diaphram.
This can be a defective blend air door or a vacumn problem.
Bill

It sounds like the air temp control bleed door motor is inop, I think it is electric in your year and model.