Question about 1999 Lincoln Navigator

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Having problems with my a/c on 99 lincoln navigator. At times a/c will blow cold air, as soon as I hit the the accelarator I hear a sound that resembles the closing of a vent and it immediately blows hot air? does anyone have any feedback? Thanks

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Typical ford Check on the firewall for all your rubber vacuum hoses where the heater hose goes into the firewall if one is broke as you accelerate the vacuum makes the heater switch open giving you heat

Posted on Jun 04, 2009

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