Question about 1994 Volvo 940

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My air bareley blows when i accelerate.i have a 1994 volvo 940 turbo.

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I have heard somewhere that this is caused by a faulty vacuum check valve which is black and white plastic and is located near centre above the rear of the engine up against the firewall. vacuum drops when you accelerate so there is not enough vacuum to keep various vacuum operated heating/cooling system valves in their selected position . the check valve keeps sufficient vacuum in a reservoir tank when vacuum at the engine manifold drops.

Posted on Aug 19, 2010

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