C4 Corvette Cruise Control Repair
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This is a one-way check valve that prevents a loss of vacuum to the A/C controls and cruise servo when the manifold vacuum drops under acceleration. To test the valve, remove the valve from the hose and apply vacuum to the port closest to the intake. It should not hold the vacuum. Next, apply vacuum to one of the smaller ports and cover the other small port with your finger; it should hold vacuum. (Remember that the vacuum hoses and check valve can deteriorate and become brittle with heat and age. This is a very common problem.) View Related Article
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