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Prior to effective engine control unit computers, vacuum switches were employed to regulate the flow of engine vacuums in automobiles. For instance, a dual port vacuum switch located in a port on the intake manifold monitored the coolant temperature in the coolant crossover. It received vacuum (port E on the switch) from the carburetor. The vacuum flowed through the switch to a vacuum solenoid (such as a heat riser, used to restrict exhaust allowing the engine to heat up faster). When the coolant heated to operating temperature the vacuum switch closed off the port (port S on the vacuum switch) turning off the vacuum to the heat riser. The result is to clear the exhaust restriction. The switch monitored the temperature and when conditions were right it performed its designed function.

See also

• Automobile accessory power
• Manifold vacuum

v t e Switch types
Analogue switch Banyan switch Battery isolator Cam switch Centrifugal switch Company switch Contact protection Crossbar switch Crossover switch Cryotron DIP switch Dry contact Electric switchboard Float switch Half-moon switch Humidistat Infinite switch Inertial switch Kill switch Key switch Knife switch Limit switch Latching switch Light switch Lightning switch Magnetic proximity fuze Magnetic starter Magnetic switch Mercury switch Miniature snap-action switch Motion-triggered contact insufficiency Optical switch Photoswitch Piezo switch Placebo button Pull switch Push switch Push-button Railroad switch Reed switch Rotary switch Sail switch Sea switch Sense switch Silicone rubber keypad Softswitch Spark gap Staircase timer Stepping switch Strowger switch Thermostat Time switch Touch switch Transfer switch Vacuum switch Vandal-resistant switch Wireless light switch Zero speed switch

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