2001 dodge ram 4x4

Black 4x4 · #1 May 22, 2008, 04:50 PM

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 cant find anything obvious

RickMN · 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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