Eclipse L4-1997cc 2.0L DOHC (1991)
Coolant Temperature Sensor / Switch HVAC: Testing and Inspection
Coolant Temperature Switch Circuit (A/C Only)
The Coolant Temperature Switch, located in the thermostat housing, is a contact type switch. It is normally in the closed position allowing current flow.
When the engine coolant temperature is 233 - 244° F (112 - 118° C) the switch will open cutting power to the ECU, and helping to prevent engine
overheating.
To test the Coolant Temperature Sensor, proceed as follows.
Engine Coolant Temperature Switch Location
1. Remove the Coolant Temperature Sensor.
