Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Single-Function for Standard Cooling
When coolant temperature is below 155°F (68°C) on 6-cylinder and V8 engines, or 120°F (49°C) on 4-cylinder engines, check ball is held against inner seat by spring tension. Manifold vacuum enters through port "1" and is applied through port "D". See Figure .
When temperature goes above specified limits, check ball is moved up in valve and manifold vacuum is applied from port "2" to port "D", by-passing delay valve, on 4-cylinder engines, or carburetor ported vacuum is applied from port "2" to port "D" on 6-cylinder and V8 engines.
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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.