A/C has mind of it's own '87 300e
 

Hi folks. A/C system seems to be working good, but something seems to be turning the heat on. It will cool just fine and then start blowing warm air. This winter it had a similar problem where it would start blowing cold air but I could get it to warm up by turning the temp control to a warmer temp. There just isn't enough room to make the adjustment on the cold side. I had a similar problem on my '85 XJ-6 and it was not getting enough air across the cabin temp sensor. Any suggestions on what to check first.
Thanks,

Bob Kopicki
'67 TR-4a
'76 GMC C15
'85 XJ-6
'87 300e
'97 VW Cabrio