THERMO Valve: Carbureted

1987 Chrysler Conquest 2.6 H, StandardSECTION Carbureted
  1. Disconnect White-striped vacuum hose from thermo valve. Connect vacuum pump to nipple "A". See Figure . With engine coolant temperature at 50°F (10°C) or less, vacuum should leak when applied. With engine coolant temperature at 77°F (25°C) or more, vacuum should hold when applied.
  2. Disconnect all vacuum hoses from thermo valve. Connect vacuum pump to nipples "B", "C" and "D" one at a time. Plug nipples other than one being tested.
  3. With engine coolant temperature at 104°F (40°C) or less, vacuum should leak when applied. With engine coolant temperature at 176°F (80°C) or more, vacuum should hold when applied.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.