Auto ac is blowing intermitantly. bad blower/fan motor?

The A/C line's , the compressor etc. wouldn't have anything to with the blower motor working intermittently . electrical power supply problem . Looking at wiring diagrams to see what all is involved in making the blower motor work would be the first step in diagnosing the problem . Knowing GM vehicle's i would say the blower control module is starting to go bad . GMC Yukon HVAC Blower Motor Won Turn On This is the same on your chevy .

In some vehicles, just because you turn on the A/C..the fan does not come on...and some, when you set the A/C to on, you have to make the fan blow to make the A/C compressor work.. Sounds like,maybe, the blower motor resistor may be bad.. they are easy to change and not too expensive..You should be able to buy one at ( some will install it for you - if you are real sweet) :
http://www.oreillyauto.com/site/c/search.oap?keyword=blower+motor+resistor&year=2005&make=Chrysler&model=Town+%26+Country&vi=5018012
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Blower Motor Resistor
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2005 CHRYSLER TOWN COUNTRY 3 8L V6 Blower Motor Control Module Resistor...

Hi Elaine , What make vehicle are you working on ? Most manufactures have a relay for hi speed an have a blower motor resistor for all other speeds . Depending on make vehicle control modules need programming in some cases . Blower Motor Problems Auto Repair Help

Power goes thru the rear blower relay, then the resistor and motor. The fan control switch provides the ground connection. I would check the rear blower relay if power is questioned at the blower motor.

Doesn't have a resistor. It has a blower motor control processor. When they go bad, the blower motor defaults to always on (go figure that logic). Pull the AUX blower motor fuse until you can get a replacement. The processor is located back by the rear blower motor.
Blower motor wont shut off Ricks Free Auto Repair Advice

it sounds like you have a bad switch for the A/C but also if the air blows from the defrost if you Xhave3 it on vent then it sounds like your blend door is not working right

From what you said I would think you have a bad/loose connection. I have never had to change the fan resistor but from what I under stand usually when the resistor is bad the fan only run with the fan speed on the highest setting. If the fan quits working try putting the fan on the highest speed setting, see if fan starts working. Sorry but that all I got for now.

This is not a blend door problem. It is a problem w/ your AC / Heater blower motor Resistor. When this goes out some vehicles will blow intermitantly. Others will blow strong in the low position and low on high. On my 2004 Silverado the resistor is located under the glove box mounted w/ 4 screws. It is a small black box no larger than a cigarette package. Laying flat on the floorboard look up and towards the center you shouldn't be able to miss it. Easy to change, simply plug the new one in and screw back in place. Took me 5 min.

you can go to auto zone and get a price of a motor and at the same time get a print out and location where your blower motor is

The blower motor resistor is bad.It either sits on the blower motor itself,under the dash or under the hood next to the firewall.Goto an auto parts store and ask for one and they will tell you where its located.Their usually easy to install and about 25 bucks.