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Thermal Switch Test

  1. Disconnect vacuum hoses from thermal switch. Connect vacuum pump to vacuum source side of sensor and a vacuum gauge to vacuum motor side of switch.
  2. Apply 14 in. Hg vacuum to switch. With thermal switch temperature less than 95°F (35°C), vacuum should be maintained.
  3. Heat switch to 95°F (35°C). The air vent valve should open and decrease vacuum to zero. Replace switch if defective. The temperatures listed are nominal switching values.
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