Quote:
Originally Posted by ctaylor738
What happens when you hit DEF? You should get full heat to the windshield. This is the 'default' position. If you still have no heat, I would suspect a plugged heater core. Is the hose on the exit side of the heater warm?
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The fan does come on with all air to the windshield but no heat & no position change from the servo. Before replacing the previously inop servo I took the top of the servo off & manually opened the water valve. This of course gave me plenty of heat but no control so I'm sure there is no air in the line problem or plugged up core/line(s).
Does anyone know the function of the diode on the pushbutton control? I know what a diode does in a circuit but could it cause this apparent "full cool" positioning of the servo? Yes, I'm grasping.........