Sonata V6-2.7L (2004)
4. With the thermostatic switch connector in couple state, install a voltmeter between 2 and 3 (-) terminal and check whether there is change in
voltage between terminals according to the temperature of the evaporator surface.
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Thermostatic switch operating characteristics
NOTE: This check should be carried out on the back probes of the thermostatic switch when it is in coupled state. If above condition is not
satisfied, remove the evaporator unit and replace the thermostatic switch.