Question about 2000 Chevrolet Lumina

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Acceleration no air, foot off gas air barely blows out vents

2000 chevy lumina, upon acceleration the a/c blows somewhere but not out the vents, you can hear it blowing. When you take your foot off the gas the a/c will barely blow out the vents.

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The vent is controlled by vacuum. Check the condition of the vacuum hose associated with the vent control. What is happening is when you decelerate, the intake manifold vacuum increases, and a diaphram is slightly pulled giving you air in the vent but very little. In normal condition the diaphram wont even pull. Solution is check for a vacuum leak in the vent control trace it coming from the intake manifold.

Posted on Jun 30, 2009

  • had9 Aug 26, 2011

    you have a vacuum ball in the driver fender well check the vacuum line it runs from inside thr fender behind the battery to the engine

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