Sonata GL V6-2.5L (1999)
Coolant Temperature Sensor / Switch HVAC: Description and Operation
The water temp. sensor is wired to the temp. actuator potentiometer and attached to the heater core inlet tube under the actuator mounting bracket with a
spring tension clip. The two leads to the clip start in the wire and connector assembly which feeds into the electronically controlled blend door actuator.
It automatically prevents blowing out of cold air at high flow rate when the outside air temperature is low with the engine not warmed up. This control is
provided only when the blower switch is in the AUTO range. Until the engine coolant temperature reaches approximately 50 °C (122 ° F) or the desired
temperature becomes equal or more than inside temperature +3 °C, cold air will not blow inside and fan speed is at low mode. In the MANUAL mode,
the speed is in accordance with the range setting and the fan control at low warm coolant temperature does not work.
