A/C suddenly started working weeks after a refill.Then stopped
 

Hi,

My AC didnt work when I bought my Z so I had the AC serviced and they said that it was holding pressure. At the time the A/C would not blow cold but your could hear the click that something was trying to work. Weeks after giving up that something was wrong I turned the AC on and suddenly it was blowing cold air. Then about a month later it stopped. I haven't taken it in to check if it still has pressure in the lines. "Assuming" it does hold pressure anyone have a vague idea what might cause it to suddenly work then stop working.

Hoping its a possible cheap repair as I dont want to stick thousands into getting the AC to work. Although its needed here in TX.