Air conditioning blower stays on after car is off

Sounds like the blower motor is going bad

Does the fan stay on even with the ignition key off? Do you have automatic heating and air conditioning controls? Automatic controls have a light up blue screen in the middle of the temperature controls, and there will be a button that says "Auto". If you do have automatic controls, the likely culprit of your fan staying on constantly is what is called the blower control processor. The blower control processor is a small computer that replaces the blower resistor commonly found in cars. When the blower control processor fails, it usually "sticks" on. It's not a cheap part, but is easy enough to replace if you're handy with basic hand tools and comfortable unplugging electrical connectors under the glove compartment area.

You will need to replace the blower motor to correct this.

Blower Motor Removal & Installation W/O Air Conditioning Blower Motor (W/O Air Conditioning)

To Remove:

1. Remove the PCM.
2. Remove the coolant reservoir.
3. Remove the rear coolant recovery reservoir mounting stud.
4. Disconnect the cooling tube from the blower motor.
5. Disconnect the electrical connector from the blower motor.
6. Remove the blower motor mounting bolts.
7. Remove the blower motor insulating cover.
8. Remove the blower motor.

To Install:

1. Install the blower motor.
2. Install the blower motor mounting bolts.
3. Connect the electrical connector to the blower motor.
4. Connect the cooling tube to the blower motor.
5. Install the rear coolant recovery reservoir mounting stud.
6. Install the coolant reservoir.
7. Install the PCM.

W/ Air Conditioning Blower Motor (W/ Air Conditioning)

To Remove:

1. Remove the PCM.
2. Remove the coolant reservoir.
3. Remove the rear coolant recovery reservoir mounting stud.
4. Disconnect the electrical connector from the blower motor.
5. Move the PCM connectors out of the way.
6. Remove the blower motor access cover screws. CAUTION
   Do not cut any deeper than necessary in order to remove the access cover.
   
7. Cut through the access cover on the cut line using a sharp utility knife.
8. Disconnect the cooling tube from the blower motor.
9. Remove the blower motor mounting bolts.
10. Remove the blower motor.

To Install:

1. Install the blower motor.
2. Install the blower motor mounting bolts.
3. Connect the cooling tube to the blower motor.
4. Install the blower motor access cover.
5. Install the blower motor access cover retaining screws.
6. Using black weather-strip adhesive, seal the cut line.
7. Connect the blower motor electrical connector.
8. Reposition the PCM connectors.
9. Install the rear coolant recovery reservoir mounting stud.
10. Install the coolant reservoir.
11. Install the PCM.

Replace the blower resister ,it is located next to the blower motor,it is your speeds,it has about 7 wires plugged into it in one plug,and has two screws holding it in,then see if the ac compressor will stay engaged.

are you saying u can't change the air temperature? do the blower speeds work ok? can u change the locations the air comes from, i.e. dash registers, defrost, floor?

Per your description, I believe you may have a blower fan relay that is stuck closed.
Remove the relay from the under-hood fuse center and see if the fan stops.
If it does stop, put the relay in slowly and see if you here the relay "click" and the fan come back on.
Let me know.
Regards,

both need hands on diagnosis. if i were to guess at air bag problem. i would have to say the clock spring in the steering column is suspect and common. as far as the a/c goes. what doesnt work? the blower or actual air conditioning?

One suggestion. Have you checked the fuses ?

I would check the AC or blower fuse to start with. If you have the drivers manual it will show you where the fuse box is. Typically there are at least two boxes to check. One in the Engine compartment and one in the passenger cabin.

Look inside the lid of the fuse box to see which fuse may apply to the AC circuits or the blower and check to see if they are blow. the metal link between the two posts that plug in. If the link is missing you need to replace the fuse with one of the same rating. Make sure you know where you took the fuse out from and put it back in the same slot if its good. Check all the main fuses if possible to see if any have blown and replace if they have.

no, did you replace the passenger cabin filter? chance are it is to late...i just found out today it is best to bc it puts pressure on the blower....its in the glove box..