Temperature Switch

Mounted on cylinder head (4-cyl. and V8's) or thermostat housing (6-cyl.), this 3-position switch has a double terminal unit with a neutral position. At coolant temperatures below 93°F, cold terminal is grounded, completing circuit to vacuum advance solenoid. In neutral position no contact is made (circuit broken). When engine starts to overheat, hot terminal is grounded and "hot" light in instrument panel is activated. On Corvette models switch also advances ignition when coolant temperature reaches 232°F.