My air conditioning work good for a while then it might not work at all for the rest of the day what could it be

Pull the fuel pick line from the tank ( normally fuel gauge sender unit) and check for a small crack or rusted line that is allowing the pump to suck in air. Check that all hoses are in good condition and not perished (cracked) before then pump

The problem is probably the blower motor relay/breaker. It is located under the hood, in a plastic cover with the rest of the relays. It is labeled either next to the relay or on the inside of the cover.
murf427

First make sure the battery is fully charged and do a "load test" to make sure it is still good. then check the alternator and charging system to make sure it's working. My VW does this when it's not charging properly. When the battery gets below a certain voltage the car will automatically shut down everything electrical to keep power for the engine and the light doesn't always come on. It's usually a boken wire. Hope this helps.

The security light is a real common problem on GM vehicles. You can fix this yourself, read this link for information, symptoms, and ways to fix it. http://vatspasslockpasskeysecurityhelp.yolasite.com/

The air conditioning probably got messed up when unhooking the battery. Id be looking for a fuse or relay that has been tripped.

This can be caused by the control head, the resistor, or the motor itself. Please read my tips at the link below. Go to the middle of the file.

Do It Yourself Diagnosis and Repair

Review the ZJ Secc24-Heating-and-Air-Conditioning (page 24 and next).

I hope that you have a nice day. Good luck (remember rated this help).

sounds like the resister for the fan is failing. it is located under the dash on the duct work for the blower (fan). you will see two wires going to it. unscrew the bolts or screws that hold it in and replace it with a new one. it should work fine after that.

There are a couple of things things that could cause this. The first thing i would check is your refrigerant level. Low refrigerant would cause your compressor to turn off. The next thing i would check is a restriction in your A/C lines. A restriction would cause a pressure difference allowing ice to build up in side your A/C lines and not allowing your refrigerant to cycle normally, and of course once the ice melted your a/c will work again.

is the fan working ?

I had the same problem. I went to garage and had the A/C recharged.