Seville V8-273 4.5L (1989)
Transmission Position Switch/Sensor: Description and Operation
Third and Fourth Gear Switch
The third and fourth gear switches are located in the transmission. They are used to tell the Electronic Control Module (ECM) when the transmission is
in third or fourth gear. The ECM uses this information to vary the conditions under which the Viscous Converter Clutch (VCC) applies or releases. The
VCC can apply in second gear under engine overheat conditions. Second gear application will reduce transmission fluid temperature and allow the
radiator to provide improved cooling to the engine.