Recently I ask about the dash heater control and was informed that I could remove the top of the dash on my 36 '99MDS.Today I did remove it and found the cable that comes off the back of the temp. adjusting knob on the dash controls.Does anyone know where the valve is located that this cable goes to?I'm getting ready to put a new radio in and when the old one is removed, I will be able to see things below the hoses for the heater ducts better but I would like to know about where to look for the valve.I think it needs some lubricant to work correctly,just blowing hot air at the moment.