LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chrysler >> 1981 >> Imperial >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Thermostatic Air Cleaners -- All Models >> Testing >> Vacuum Motor Test
September 30: LEMON manuals is back up on a temporary server! Slowness is possible

Vacuum Motor Test

  1. With engine not running, air cleaner may be removed for this test. Disconnect vacuum hose from vacuum motor.
  2. Connect an external vacuum pump to vacuum motor. Apply specified vacuum for "Door Fully Closed". See Air Control Door Opening Vacuum specifications table .
    Vacuum Control Temperature Sensor Specifications

    Application Air Door Closing Temp. (°F) Air Door Opening Temp. (°F)
    American Motors 40 55
    Chrysler
      1.7L & 2.2L 50 85
    2.6L 85 113
    All Other Models 50 100
    Ford Motor Co.
      Sensor Color Code
        Brown 75 75
    Black or Pink 75 90
    Blue or Yellow 75 105
    General Motors Corp.
      Buick 77 (1)123
    Cadillac 85 105
    Chevrolet
        Citation 77 (1)123
    All Other Models 80 (1)100
      Oldsmobile 77 (1)123
    Pontiac 77 (1)123
    (1) ± 20°F.
  3. Air control door should remain closed to outside air (open to heated air from shroud around exhaust manifold).
  4. Next, apply specified vacuum for Door Fully Open In. Hg, see Air Control Door Opening Vacuum specifications table . Air control door should open to outside air (closed to heated air).
  5. Apply 20 in. Hg to vacuum motor and pinch off hose. Vacuum should not leak down more than 10 in. Hg in 5 minutes. If vacuum motor fails any of these checks, replace it.
    Air Control Door Opening Vacuum

    Application (1) Door Fully Closed Less Than In. Hg (2) Door Fully Open Max. In. Hg
    Chrysler Corp.
      4-Cylinder Models 2 4
    All Other Models 5.5 8.5
    American Motors
      4-Cylinder 7
    6-Cylinder 4
    Ford Motor Co.
    General Motors Corp.
      Buick 7
    Cadillac 4-6 (3)
    Chevrolet 7
    Oldsmobile 7
    Pontiac 7
    (1) Closed to outside air (heated air position).
    (2) Closed to heated air (outside air position).
    (3) Manifold vacuum.
scientia non olet · About LEMON Manuals