Charge Temperature & Coolant Switch Test
- Turn ignition off and disconnect wire from temperature switch. Connect one lead of ohmmeter to good engine ground or to switch's ground terminal. Connect other lead to center terminal of coolant switch. Check for continuity.
- On a cold engine, continuity should be present (resistance less than 100 ohms). If not, replace switch. The charge temperature switch must be cooler than 60°F (16°C) to obtain this reading. On an engine at normal operating temperature, the terminal should show no continuity. If it does, replace coolant switch.