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Heated Air Intake System Test

  1. Disconnect air duct from air cleaner snorkel. Disconnect vacuum line to heated air intake system air temperature sensor. Apply 15 in. Hg of vacuum.
  2. Vacuum should close heated air door when air temperature is below 76°F (25°C) and then slowly bleed down, opening the heated air door.
  3. If vacuum builds up, closes heated air door and then bleeds down, go to ENGINE COOLANT SENSOR CALIBRATION TEST  . If vacuum builds up but heated air door does not close, repair or replace door as necessary. If vacuum does not build up or does not bleed down, replace air temperature sensor. If vacuum builds up and bleeds down, but heated air door does not open, repair or replace door as required.
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