Why does my Ford Focus AC cool sometimes and other times it does not?

My 02 Ford Focus has really cold AC sometimes but othertimes not. Sometimes it depends on where it was sitting before I drive. For instance when parked under a car port in in aparking garage where it is not under direct sun, the AC starts and remains cold. When parked in the sun, the AC does not ever get cold. What could cause this?Why does my Ford Focus AC cool sometimes and other times it does not?Take the car to a car wash a clean the condenser that may help also check your R134 and see if its low.Why does my Ford Focus AC cool sometimes and other times it does not?
Thank You to everyone for your helpful answers!

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Why does my Ford Focus AC cool sometimes and other times it does not?When the car is in the shade the interior temperature is the same as the outdoor. When parked in the sun it is about 140 degrees and it takes a lot of BTU to remove all of that heat from the seats, carpet, dash... maybe it is okay but have the freon checked it is seven years old so it could be a tad low even if it has no detectable leak.Why does my Ford Focus AC cool sometimes and other times it does not?
its your climate control. its sending the wrong signal to the computer and it doesnt know weather to go on or off. its all computerized so think about it. you can get one at the junkyard for about 15bucks... if it dont work just return itWhy does my Ford Focus AC cool sometimes and other times it does not?have the freon checked