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Home >> Chevrolet >> 1989 >> Corvette 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Air Cleaner - Thermostatic >> Component Testing >> Vacuum Motor Test

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 close heated air door. See the AIR CONTROL DOOR CLOSING VACUUM table. If door does not close at specified vacuum, replace vacuum motor.
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