Corolla/FX L4-1587cc 4A SOHC (1984)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
1.
Drain coolant and remove thermo switch.
2.
Cool thermo switch to below 109°F and check that switch has continuity.
3.
Heat switch to above 131°F and check that there is no continuity.
4.
Apply liquid sealer to threads of switch and reinstall it, then refill radiator with coolant.