Charge Temperature & Coolant Switch
- Turn ignition switch "OFF" and disconnect wire from charge temperature switch. Connect one lead of ohmmeter to a good engine ground (or to switch's ground terminal). Connect other lead to center terminal of coolant switch. Check for continuity.
- For a cold engine, continuity should be present (resistance less than 100 ohms). If not, replace the switch. The charge temperature switch must be cooler than 60°F to obtain this reading.
- For an engine at normal operating temperature, the terminal should show no continuity. If it does, replace coolant switch.