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Home >> Plymouth >> 1981 >> Arrow Pickup Base, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Idle Enrichment System >> Testing >> Time Delay Test >> Coolant Vacuum Switch
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Coolant Vacuum Switch

  1. Disconnect molded connector from valve and attach a 1/8" I-D. hose to bottom port of valve. With radiator top tank warm to touch (no warmer than 75°F), blow through hose. If air cannot be blown through valve, replace valve.
  2. Bring engine to normal operating temperature. Attach a vacuum pump and gauge to bottom port of valve. Apply ten inches of vacuum. If vacuum level drops more than one inch in 15 seconds, replace valve.
    Fig 1: Sectional View of Chrysler Corp. Idle Enrichment System
    G09337131Courtesy of CHRYSLER GROUP, LLC
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