I have a 2014 Crosstrek with an air conditioner that works intermittently. I can turn it on and it blows cold air for a few minutes and then it blows warm air. I turn it off, wait a bit, then turn it back on and cold air blows and then warm air again. Any ideas? Most web searches I've come across state that I have leak... But if it's leaking then wouldn't it only blow warm air and not intermittently blow cold? Thanks for any input!!