Why does the air conditioning / heater blower cut in and out and sometimes doesn't work at all?

Hi, when it comes to vehicle air conditioning I advise taking it to a
professional with the appropriate experience/qualification...I have heard instances of individuals being blinded by freon.
If your blower only works sometimes might be that the compressor has issues.

is the fan working in all speeds?could be a fan resistor if not or cage on blower motor restricted some how thats what i would check first

will it blow air on any setting besides defrost

Check whether you might have bad connection or contact,or e ven bad switch.

I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

I had a similar problem with my 2003 intrepid. The problem turned out to be the control panel. I went to a salvage yard and got one.

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.

Hi Adam,sounds like your blower motor resistor is bad,it controls your blower motor speed.Here's a link on how to replace,read the beginning and it will explain how the system works,as it says,their a different types for your vehicle so remove and take to Autozone and match it up with a new one. Repair Guides Heating And Air Conditioning Blower Motor AutoZone com Here's a link to some new one's. Blower Motor Resistor

You might have a bad speed selector switch, or your blower motor resistor is faulty.

Notes Electronic Automatic (RPO C68)/ Dual Zone Air Conditioning (RPO CJ2)