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    Black 4x4's Avatar
    Black 4x4 Posts: 1, Reputation: 1
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    #1

    May 22, 2008, 04:50 PM
    2001 dodge ram 4x4
    Had the transmission rebuilt now when I acelerate with the A/C on it changes to defrost when I let off it goes back to A/C looked for a vacuum line off and can't find anything obvious
    RickMN's Avatar
    RickMN Posts: 244, Reputation: 52
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    #2

    May 22, 2008, 05:49 PM
    This is the "Mode" motor defaulting to its "non-vacuum" powered position when you accelerate. Since you had the transmission rebuilt, it's likely that a vacuum line is connected wrong. Get yourself a vacuum diagram and trace backwards from the mode motor. Also check the mode motor with a hand held vacuum pump to make sure it holds vacuum when it's applied.

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