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Home >> Plymouth >> 1978 >> Arrow Base, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Auto. A/C Systems >> Testing >> Preliminary Procedure >> "Hi-Defrost"

Preliminary Procedure: "Hi-Defrost"

Push "HI-DEF" and observe the following:

  1. Blower speed should increase in steps and discharge air temperature should be rising to maximum.
  2. As discharge air temperature increases to maximum, blower speed should increase in steps to high. Tester mode knob will no longer be effective (except for "PARK").