Climate Control (ECC) Code 40 after Disconnecting Battery

Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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uuyankee
LE Member
Posts: 7
Joined: Thu Mar 17, 2011 7:38 pm
Year and Trim: 93 SSEi

Climate Control (ECC) Code 40 after Disconnecting Battery

Post by uuyankee »

I disconnected my battery to clean the posts. When I turned on the ignition the AC started up as it usually does after battery disconnections. The system had been working properly, but now it shows a code 40, Driver Air Mix Motor cirduit open or shorted or not calibrated. Each time I start the car I also hear the air mix door cycling very slowly. Sort of a groaning sound. Eventually the blinking indicator times out and the AC seems to work properly.

Here's the question - to I need to somehow readjust the air mix door? if so is it hard to get to.
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sonoma_zr2
Retired Gearhead
Retired Gearhead
Posts: 3643
Joined: Tue May 20, 2008 9:39 am
Year and Trim: 1999 SSEi
1997 SSEi-Resting-353K
Location: Montevideo, MN

Re: Climate Control (ECC) Code 40 after Disconnecting Batter

Post by sonoma_zr2 »

There is a good chance the air mix actuator has failed (cracked gear). This likes to happen when power is removed then added back. It forces the actuator to go through the calibration process, finding the open and closed limits. This strains an old and brittle gear and causes it to crack. There is a write up in tech info for the air mix actuator.
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