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.
Coolant Temperature
Various switches are used to signal temperature changes to the MCU. Vehicles with 4 cylinder engines use an electric coolant switch mounted on a Ported Vacuum Switch (PVS). On 6 cylinder engines, a PVS sends vacuum to an electrical switch (mounted with 3 others) which is open when vacuum is applied. On V8 engines, 2 switches are mounted with sensors in a coolant passage. One switch is open when the engine is warm; the other is open both when the engine is cold and when it has overheated.
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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.