Air conditioning is not engaging when button is pushed to turn on.

Try this link
http://partsblog.olathetoyota.com/1511/common-ac-problems/

I have the same problem right now, and from what I can figure, it looks like an intermittent thermal protector switch on top of the AC compressor. My 2003 Civic air conditioning works fine for 20 minutes or so and then stops working. If this switch is faulty, the compressor clutch won't engage and you won`t get cold air. I will get it replaced soon, but it seems like the access is not easy.

Hi, depending on the vehicle, there can be different controls. Standard control, 4hi, use in slippery conditions, never on dry pavement. Just push the button, and it will engage. 4low is for extreme conditons and the transmission must be in neuteral to engage 4lo. If you have auto 4wd button, just press the button in slippery conditions. If you have a denali, it is all wheel drive, and there are no buttons to push. So, depending on the model, there are multiple ways, but pushing the button engages it. Good luck...Goop

Try replacing the fan relay under the hood in the black plastic box near the firewall. Remove the cover by releasing the clips and there should be a diagram on the back side of it to help you locate the cooling fan relay(s). Pull out the correct relay with your hand and push the new one in, then try starting the engine and turn the air conditioning on high. One of the fans should turn on with the compressor but if it dos not engage, let the engine warm up and monitor the temperature gauge while you listen for the fan(s) to engage.

The pulley on the air condition has to turn it has a belt on it. The Compressor engages to pre cool the evaporator. Most likely you have a blend door pod leak or leak in the hose or the sampler valve is bad. I would replace the sampling valve behind the glove box/air bag. As that reads the cabin temp and if it thinks the car is cold the heat will stay on because everything is automatic. All vents will blow cold when it thinks its hot and in addition to floor and corner dash center vents will blow cold when it works. If the direction of air is correct then the A/C system may have a leak or need a charge of freon.

The air gap may be too wide between the clutch disc and plate. It usually happens from wear. You can test this possibility by engaging the clutch electrically as you have done and then push on the disc slightly with the handle of a hammer or screwdriver. Be careful not to get your hand or fingers too close while the engine is running. Basically you are helping the magnetic field pull the disc in. I hope this helps.

It may be low on refrigerant if the pressures are to low, the compressor will not engage.

usually normal condition for sharp turning, check and see that all tires are the same size. if you replaced two on front and not on rear this may be your problem

your air conditioning system needs recharged. im sure of it.

it can be a relay prob or it might be that the a/c coolant, the R-134a (this is what they replaced freon with), may be low and that you may have to just top it off because the pressure switch within your a/c system may not be engaging because of that.