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Vacuum Motor Test

  1. Remove air cleaner from vehicle. Disconnect vacuum hose from vacuum motor. Apply 20 in. Hg vacuum to motor and pinch off hose. Vacuum should not leak down more than 10 in. Hg in 5 minutes. If vacuum motor does leak down, replace it.
  2. Connect a vacuum pump to vacuum motor. Apply specified amount of vacuum to vacuum motor to open or close heated air door. If door does not open or close at specified vacuum, replace vacuum motor.
AIR CONTROL DOOR OPERATING VACUUM

Application Vacuum In. Hg
General Motors 7
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