Thanks for you help in trying to figure this out. My daughter got the used 2007 Caliber in late fall, 2018. In the spring on 2019 I bought the AC recharge kit and added refrigerant following the directions, using the gauge. All last summer and early fall the car cooled great. After a really warm day in last November, my daughter said the AC is not getting cool. This spring, she has nothing but regular air blowing no matter what I do. Here is a summary of all I have gone over; I am pretty much stuck at square 1.

1: The fan operates properly at all speeds.

2: The air vent selector cable works; air comes out properly at all dash & floor openings.

3: The temperature control **** (a manual blend system - not digital) works properly, the air heats up and cools down; except no AC.

4: The serpentine belt is turning correctly. From under the car, the compressor is clearly turning.

5: The AC compressor is not cycling, there is no cooling. (From what I understand there is no mechanical clutch, like in my Buick; somehow it has pistons that compress without a clutch. That is where I am lost.)

6: Pressure on AC gauge hose to supply valve shows high pressure; normally would drop if the compressor were cycling.

I am still trying to find out where I go from here. I need guidance to make any more progress. If anyone knows what I should do next, any other tutorial; I am grateful for any assistance.

Thanks for all replies.

 

The compressor turns all of the time whether the a/c it turned on or not. I think there is a wire on the back of the compressor somewhere, check and make sure it's still plugged in. Check all of the fuses well. It is possible, it these are good, then there is a possibility that the system is clogged somewhere or the compressor is possibly bad internally and not pumping any refrigerant.

 

Thank you so much for helping me with a basic, but vital check. You were correct! Last fall I had to move the compressor to change the oil sensor. I had to put everything back in a hurry and I failed to plug in the compressor. I've plugged it back in; it's too cold to test today, but this should be all it needs. Thanks again for the reminder.