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Air stops blowing when going up a hill. the blower is running

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You probably have a vacuum controlled mode switch and there may be a vacuum leak in the engine compartment that is causing your system to default to defrost when engine vacuum is low (such as when accelerating or going uphill). See if you can find the vacuum line that comes from the engine intake manifold to your heater control panel, make sure the hose isn't loose or cracked at the manifold. The vacuum line is a small plastic line that comes out of the firewall and goes to the engine. Also check out any other hoses in the area. If all of these are OK, it may be that your mode switch is leaking a bit. If you have questions, please let me know.

Posted on Oct 15, 2010

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