Passport 2WD L4-2559cc 2.6L SOHC (4ZE1) (1994)
Evaporator Temperature Sensor / Switch: Description and Operation
The electronic thermostat senses the temperature of cool air from the evaporator by means of the evaporator temperature sensor. This information
determines whether the thermostat will provide ground to the A/C thermostat relay. When the temperature becomes too low, ground is not provided.