Sorry to start another thread but this thing keeps biting me in the rear. (1985 300SD)

Car is up to operating temp. Set ACC to just under max heat. Cool air from vents. If I put to max heat same thing. It seems like more heat from vents below than from dash vents. Now I hit the Economy button and keep heat set at same place. Much warmer now.

I rebuilt monovalve, flushed core and checked aux pump. All seems OK.

Something funny I noticed. When I set the thumbwheel for heat and hit any of the ACC buttons other than economy, I can hear the AC compressor clutch kicking on. When I hit the economy button with the heat on the air gets noticeably warmer and the compressor kicks off.

Is my air conditioning kicking on the same time as my heat? I am having difficulty with this. I was going to try and unplug my compressor and see if my heat works correctly then.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R