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.
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HOMESERVICE MANUALSPLYMOUTH1984HORIZON L4-97 1.6L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)TESTING AND INSPECTIONCOOLANT TEMPERATURE SWITCH
1984 Plymouth Horizon L4-97 1.6L SOHC
Coolant Temperature Switch
1984 Plymouth Horizon L4-97 1.6L SOHCSECTION Coolant Temperature Switch
1. Turn ignition Off and disconnect wire from temperature switch.
2. Using an ohmmeter, connect one probe to a ground or to temperature switch ground terminal. Connect other probe to center terminal of switch.
3. On a cold engine, there should be continuity with a resistance reading less than 100 ohms. If not, replace switch. The charge temperature switch must be cooler than 60°F for this reading to be obtained.
4. On a hot engine (at normal operating temperature), there should be no continuity. If there is continuity, replace temperature switch or charge temperature switch.
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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.