I have been reading up and seen where others have had no heat from their heater core. That is not my problem. My issue is the exact opposite. My heater never turns off. I have an '82 P-Type. I can turn off the fan but I can still feel heat lightly coming through the vents. It's too darn hot to drive in the summer. Any thoughts on what I can do to stop the heat? The control panel is kind of floating there. A previous owner broken whetever it was screwed to. Of course my air conditioner is non-operational.