Question...
1973 Barth... 5 knobs by right knee that should or could operate heater / demister / fans. Anyone have any ideas?
The hunt goes on....
George

Hey George...
On my '73 the 5 knobs (from left to right) are 1.Pull for heat 2.Left floor vent 3.Left windshield defrost 4.Right windshield defrost 5.Right floor vent. If the first knob either doesn't or is hard to operate it may just need lubed, but it also may be that the hot water valve in your heater hose is stuck and needs replaced.

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C-YA!