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What is the vacuum valve on the return side of the heater hose on a 69 Chevy 350 for?
Wiki User
∙ 12y ago
That is called a heater control valve.
When you are not using your heater, vaccume closes a small valve that's in the control valve and stopes the water from going through the heater core. Therefore you get no heat inside of the cab.
Wiki User
∙ 12y ago
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