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Coolant Temperature Override Valve: 4.2L

  1. Coolant temperature must be below 105°F (41°C). Inspect vacuum hoses for air leaks and proper hose routing. See Figure .
  2. Disconnect vacuum hose from TVS and connect hose to vacuum gauge. Operate engine at 1500 RPM. No vacuum should be indicated. If vacuum is indicated, replace CTO valve.
  3. Idle engine until coolant temperature is at least 115°F (46°C). Accelerate engine to 1500 RPM. Carburetor ported vacuum should be indicated on vacuum gauge. If not, replace CTO valve.
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