My 3 year old SPF was blowing cold air on one drive and hot air the next time I drove it. There was no tapering off of temperature like a leak so I checked all the fuses behind the fuse panel in the dash and even pulled the a/c switch control panel in the door to check the connections. I don‘t know which fuses control the a/c but all those in the dash were good. Are there any hidden fuses or switches I can check? Any ideas before I try to find someone to look at it?