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Yes install it on the cold water line as close to the heater as possible.
The heater/ac doors are all electric. They are not vacuum controlled.
Ask the manufacturer for the safest way to do install it
Same as any sink. The vacuum breaker installs in the backwash unit. Just plumb in hot & cold, and plumb out a drain line.
The heater blend door is not run by vacuum. It is run by an electric actuator.
A vacuum breaker is usually installed at the top of a vertically-mounted drain pipe leading to a drain. The water drainage hose from an appliance such as a dishwasher or washing machine should never be plumbed directly into a drain stand pipe without a vacuum breaker. The vacuum breaker prevents contaminated water from the drain being sucked back into the appliance if it has a fault.
The heater box is all electric on a 2004 Dodge Ram.
Depends on the type of car some by vacuum others by electric motors. Johnny Texas.
That would depend on the application as there are many uses and shapes and specifications for a vacuum breaker
A vacuum breaker does not allow back flow into the potable water system A syphon breaker is normallly installed on a tank that there is a possibility of the tank imploding
"Air" and "Vacuum" describe how the breaker extinguishes the arcing current. An Air breaker opens far enough that the dielectric strenght of air is enough to extinguish the arc. A vacuum breaker's contacts are in a vacuum. Oil breakers use oil. SF6 breakers use SF6 gas to extinguish the arc.
The doors are electric. You most likely have a broken door inside the heater box under the dash.