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Cold Engine

  1. Ensure engine coolant is below 122°F (50°C). Disconnect vacuum hose No. 27. Attach vacuum gauge to vacuum hose at tubing manifold. Check for vacuum at idle speed. There should be vacuum. If vacuum is present, proceed to HOT ENGINE test.
  2. If no vacuum, disconnect other hose and check for vacuum at hose. If there is vacuum, replace thermovalve C and retest. If no vacuum at hose, check auxiliary intake vacuum hose for leaks or blockage.
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