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.
LS400 Water Temperature Switch
Using a DVOM, check for continuity between water temperature switch terminals. For water temperature switch location, see Figure. See WATER TEMPERATURE SWITCH CONTINUITY table. If water temperature switch continuity is not as shown, replace switch.
| Temperature | Continuity |
|---|---|
| Below 181°F (83°C) | Yes |
| Above 199°F (93°C) | No |
Use the Manual With the Right Hardware
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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.
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