THERMO Switches (1) And (2)
- Drain coolant from radiator into a container. Remove thermo switch from intake manifold. Cool thermo switch (1) to below 43°F (6°C), or switch (2) to below 109°F (43°C), by placing in ice water. Using an ohmmeter, check that there is continuity.
- Heat switch (1) to 64-208°F (18-98°C), or switch (2) to above 131°F (55°C) with hot oil. Check that there is no continuity. Heat switch (1) to above 230°F (110°C). Check that there is continuity. Apply liquid sealer to threads of switch and reinstall. Fill radiator with coolant.