Checking 212°F Temperature Switch

Connect test light to temperature switch and 12 volt power source. At a coolant temperature above 212°F, test light should be lit.

Fig 1: TWO-WAY VALVE RELAY (450 MODELS)

Courtesy of MERCEDES-BENZ USA

Fig 2: TWO-WAY VALVE & RELAYS (EXC. 450 MODELS)

Courtesy of MERCEDES-BENZ USA