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Home >> Chevrolet >> 1978 >> Forward Control 5.7L Eng VIN L, Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Auxiliary Emission Control Systems >> Thermostatic Air Cleaner >> Testing >> Vacuum Control Temperature Sensor Test

Vacuum Control Temperature Sensor Test

  1. Tape a thermometer close to the vacuum control temperature sensor, located inside the air cleaner. Leave wing nuts off of top of air cleaner so top can be removed quickly to check thermometer while performing tests.
  2. With a cold engine, temperature below vacuum control temperature sensor specifications, check air control door in air cleaner. It should be in the full heated air position (closed to outside air) with engine running.
  3. With engine running at fast idle, observe air control door. When door reaches full open position (outside air only), quickly remove air cleaner top and read thermometer. Compare thermometer reading with specifications. See VACUUM CONTROL TEMPERATURE SENSOR SPECIFICATIONS  table. If reading is not to specifications, perform VACUUM MOTOR TEST. If vacuum motor tests okay, replace sensor.
    VACUUM CONTROL TEMPERATURE SENSOR SPECIFICATIONS

    Application Air Door Closing Temp. (°F) Air Door Opening Temp. (°F)
    Chrysler Corp. 60 90
    Ford Motor Co.
      Sensor Color Code
        Brown 60 90
        Black or Pink 60 100
        Blue or Yellow 60 115
    General Motors 80 80-120
    IHC 60 90
    Jeep 83 90
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