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If your A/C blows cold but doesn’t come out the right vent, or moves from the dash to the defroster on acceleration, then check out this vacuum check valve on the firewall. The line from the vacuum tree enters the side, and the lines going into the bottom are for the vacuum reservoir (left line going in to the right inner fender) and to the main vacuum controls (right line going into the firewall). Several problems could be here, including a leaking reservoir (possibly from an accident or age), a bad check valve, or weak vacuum from the engine. View Related Article
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