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.
Temperature Switch Test
Disconnect temperature switch lead from distributor modulator valve and connect it to a test lamp with a good ground. Turn on ignition switch and warm temperature switch with hand or sponge saturated with hot water. Light should go on when switch temperature exceeds 65°F. If light does not go on, circuit is open or grounded or switch is faulty. Cool switch until it is below 49°F (an aerosol spray such as starting fluid should provide sufficient cooling), light should go out. If light does not go out, either it isn't cooled enough or switch is faulty.
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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.