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Home >> Buick >> 2017 >> Encore Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Manual >> Repair Instructions >> Mode Control Cam Alignment (C60) >> Alignment Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Alignment Procedure

  1. Remove Heater and Air Conditioning Evaporator and Blower Module. Refer to Heater and Air Conditioning Evaporator and Blower Module Removal and Installation
  2. Remove Mode Control Cam. Refer to Mode Control Cam Replacement (C60 Mode Cam) 
    3. Fig 1: Mode Cam Screw And Mode Cam
    GM4151442Courtesy of GENERAL MOTORS COMPANY
  3. Remove the mode cam screw (1) and the mode cam (2) from the heater and air conditioning evaporator and blower module.
  4. Inspect the mode valve levers and internal vent valve operation prior to installing the new mode control cam.
  5. Replace the components affecting the proper operation of the vent valves.
    6. Fig 2: Identifying Defrost Valve Lever, Vent Valve Lever And Heater Valve Lever
    GM2963910Courtesy of GENERAL MOTORS COMPANY
  6. Rotate the defrost valve lever (1), and vent valve lever (2) clockwise, and heater valve lever (3) counter clockwise to the position shown.
  7. Using a small brush, apply a lithium based lubricant to the channels of the heater cam, and the mode cam where the levers travel.
    8. Fig 3: Identifying Heater Cam, Heater Valve Lever Pin, Mode Control Cable End And Screw
    GM2963911Courtesy of GENERAL MOTORS COMPANY
  8. Install the heater cam (1) aligning the channel on the back side heater cam with the heater valve lever pin (2).
  9. Install the mode control cable end (3) into the heater cam, aligning the large male tooth gear on the mode control cable end with the larger heater cam female tooth gear as indicated by the arrows (4).
    10. CAUTION:

    Refer to Fastener Caution .

  10. Install the mode control cable retaining screw (5) and tighten to 2.0 N.m (18 lb in).
    11. Fig 4: Control To Vent Mode Position Indicated By Lead Line
    GM4515392Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    If the heater cam is not aligned to heater valve lever pin correctly, the mode control knob will not function properly.

  11. Turn the control knob on the heater and air conditioning control to the vent mode position as indicated by the lead line (1).
    12. Fig 5: Mode Cam, Defroster Valve Lever Pin, Vent Valve Lever Pin, Mode Control Cam And Large Male Tooth
    GM2963914Courtesy of GENERAL MOTORS COMPANY
  12. Install the mode cam (1) aligning the channels on the back side mode cam with the defroster valve lever pin (2), and the vent valve lever pin (3). The pins should be visible through the inspection windows.
  13. Verify that the large female tooth on the mode cam (4) is aligned with the large male tooth (5) on the heater cam.
  14. Install the heater and air conditioning mode control cam bolt (6) and tighten to 2.0 N.m (18 lb in).
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