Civic CX Hatchback L4-1590cc 1.6L SOHC MFI (1997)
Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
1. Remove the A/C thermostat.
2. Connect battery power to the No.3 terminal, ground the No.2 terminal, and connect a test light between the No.1 and No.3 terminals.
NOTE: Use a 12 V, 3W - 18W test light.
3. Dip the A/C thermostat into a cup filled with ice water, and check the test light.
Serpentine-type evaporator
The light should go off at 36 - 39 °F (2 - 4 °C) or less, and should come on at 39 - 41 °F (4 - 5 °C) or more.
Laminate-type evaporator
The light should go off at 39 - 43 °F (4 - 6 °C) or less, and should come on at 43 - 45 °F (6 - 7 °C) or more.
If the light doesn't come on and go off as specified, replace the A/C thermostat.
