Question about Volkswagen Passat
Hi, the problem may be a leak in the vacuum supply to the control valve assembly or the hose from the control valve to the servo, which becomes worse when the hose is cold and brittle. I recommend replacing the vacuum hoses from the engine intake manifold to the valve and from the valve to the servo. If this doesn't solve the problem, I would check the servo for a torn diaphram by applying a vacuum to the servo and seeing if it will hold a vacuum. Finally, the leak could be in the control valve itself, so I would apply a vacuum there to see if it will hold. You would need a vacuum pump or at least a gage and a vacuum hose tee to do these vacuum checks. Please let me know if you have questions, and thanks for using FixYa.
Posted on Mar 20, 2011
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Posted on Jan 02, 2017
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