Question about 1999 Dodge Ram

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A/c goes to defrost on incline at high way speed, why and how do I fix it?

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This vent is conytolled by vacuum and at high speed or going up an incline the vacuum drops nearly to 0 causing the vents to go to defrost

Posted on Aug 28, 2010

  • blueunseason Sep 08, 2010

    You still have not answer the ?. what could cause this to occure,controller is called what ?

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