I recently had my a/c compressor and water pump replaced. When using the a/c at first it would occasionally not blow any air at all. I figured the blower wasn't working properly. The a/c then cut back on later that day and worked fine. It occasionally stopped blowing any air and then later started working. It hasn't been stopping for about a month now which is good. Today the a/c only blew hot air for some reason. I don't know what the problem could be??