Recently cool weather came to south Florida. Me being a native Floridian actually used the heater for the first time in almost a year. Since then the heater seems to like being on, not all of the time and irregardless of temperature selection. When the a/c is on, it will blow cold when the compressor is engaged and then hot when the compressor turns off. I have flushed the cooling system and the problem persists. The car is a 1984 Euro 500 SEC. Any help would be greatly appreciated.

ps: Don't hate me for being from Florida. I knew who I was voting for on election day and could figure out the ballot myself. :)

If you car has a monovalve, that would be my guess...Let the experts talk.