Push the lever (1) up (to RES+). If the vehicle speed is over 25 mph (40 km/h), the vehicle will resume the preset speed.
Hyundai Tucson (LM) 2010-2015 Service Manual: Engine Coolant Temperature Sensor (ECTS) Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Remove the ECTS (Refer to "Removal").
3.
After immersing the thermistor of the sensor into engine coolant, measure resistance between the ECTS terminals 3 and 4.
4.
Check that the resistance is within the specification.
Specification: ...
Hyundai Tucson (LM) 2010-2015 Owners Manual: Severe driving conditions
A - Repeatedly driving short distance of less than 5 miles (8 km) in normal temperature
or less than 10 miles (16 km) in freezing temperature
B - Extensive engine idling or low speed driving for long distances
C - Driving on rough, dusty, muddy, unpaved, graveled or salt-spread roads
D - Drivin ...