The A/C when turned on, within 20 minutes of being turned on, will all of the sudden for 20 seconds, minimum, blow hot air despite being on the coldest setting. There is also a rattle or vibration heard when the ac is on and the car is idling ( intermittently) and at about 1700 RPM 9 everytime the RPM is 1700 the vibration noise can be easily heard. We took the vehicle ( with 9000 miles ) to the dealer, the first 2 times the dealer had the Equinox they said everything was fine and they could not find any of the symptoms aforementioned. Then on the 3rd visit to the dealer, I personally drove the Equinox with the mechanic. During this drive it became evident the vibration noise only occurred with the ac on and at 1700 RPM ( roughly) the mechanic said he would put a ac controller valve on. After the new valve is placed on the ac the vibration noise is still evident and the air is still blowing warm every so often on each car trip. The mechanic said he called Chevrolet and Chevrolet said the ac is " working too well, that is why it blows warm air out occasionally" even on the coldest thermostat setting.

- Goshen, OH, USA