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Vacuum Control Temperature Sensor Test

  1. With engine cold, check damper door. It should be in open snorkel position. Place thermometer inside air cleaner, near sensor.
  2. With engine temperature below 80°F (27°C), start engine and run at idle. Damper door should be in closed snorkel position. When door starts to open, read thermometer in air cleaner. Temperature should be 100-140°F (38-59°C). If door does not begin to open at this temperature, replace sensor.
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