Sonata V6-2.7L (2004)
Coolant Temperature Sensor / Switch HVAC: Description and Operation
WATER TEMPERATURE SENSOR
DESCRIPTION
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 the blowing out of cold air at a high flow rate when the outside air temperature is low when the engine is 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 and warm coolant temperature does not work.
CHECKING THE OPERATION OF WATER TEMP. SENSOR
1. Immerse the water temp. sensor in water.
2. Using a stove, heating the water measure the resistance between terminal 1 and terminal 2.
Check the resistance value is within specification as shown in the graph.
