? on battery disconnect and air mix control problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-26-2008, 09:04 AM   #1
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Default ? on battery disconnect and air mix control problem

I am taking my Park Ave in tomorrow for a new TC, they have to remove the tranny. Will they have to disconnect the battery ? If they do will I then hve a problem with my climate control air mix gear ?

Should I just shut the heater OFF before taking in the garage ? They said the whole job will take about 5 hours.

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Old 03-26-2008, 09:09 AM   #2
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For safety, yes, shut off the ECC.
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Old 03-26-2008, 11:43 AM   #3
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I agree with WillWren, shutting off the ECC before disconnecting the battery is probably a wise thing to do.

Having said that, I don't think removing battery power is necessarily the cause of airmix actuator failures, but it does seem to exacerbate an existing or latent problem. Most likely, if you have issues after a battery disconnect, the problematic actuator gear prolly already had a crack in it. I suspect disconnecting the battery causes the ECC to go into a self-calibration which drives the actuator full cold and full hot so it knows where it is. I think when the door hits the closed or open position, the gear slips on the shaft which either enlarges the crack, or loosens the press-fit of the gear, or both. This, however, is purely speculation on my part - experience based, but speculation nonetheless.
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