Quote:
Originally Posted by deerefeed
....operation of the rear fan control? .
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THe fan speed control itself is straight forward: that you have found by yourself. What you want to know is how to get heat or no heat, and direct air to floor or to top vents. Here is the plan:
If front heater control is set on A/C, VENT or MIX VENT/FLOOR, then the rear fan will deliver NO HEAT and air will be directed to the top vents.
IF front heater is set to HEAT(floor), DEF or HEAT/DEF, then the coolant valve to the rear will open and rear fan will blow warm air to the floor and to rear window vents.
Notice that the vacuum operated coolant valve can become defective with time. It can be stuck in open or closed position. Mine has fallen apart from corrosion.