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1992-1999 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 and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-18-2008, 08:41 AM   #11
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Default Re: Always blowing heat

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Originally Posted by 93RedSled-SSE
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Originally Posted by smallengineguy
My 96 SSEi has the auto climate control. When you shut it off, the fan shuts off, but it still throws heat at the floor.
Had to go back to the first post, I think he means turning off HVAC (probably when moving) heat still vents out at the floor just from force of outside air.
That'* exactly the problem. I'll have to check by turning down the temp and see if that changes it. But if I recall, my other car didn't continue to blow any air out of the footwell when you shut the heat off. It was like a door closed, stopping the airflow. I'll also have to unplug the blower motor to see if that stops it. It'* going in the shop for UIM and LIM gaskets this weekend too.
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Old 04-18-2008, 12:46 PM   #12
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Default Re: Always blowing heat

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Originally Posted by smallengineguy
my other car didn't continue to blow any air out of the footwell when you shut the heat off. It was like a door closed, stopping the airflow.
Not these cars. You ALWAYS get some, although it is a small amount, airflow thorugh the front vents. A couple of summers ago, I had my airmix actuator fail and the system would only blow hot (max hot) air most of the time. Until I got it fixed, I would turn the system off and open the windows, but my feet would still get the full heat. Not a fun way to spend an Arizona summer.
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Old 04-18-2008, 01:29 PM   #13
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That must be it, then- the airmix actuator. I'll ask where it is once I remove my dash...
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Old 04-18-2008, 03:25 PM   #14
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You don't have to remove the dash to do the air mix actuator.
Here is where it sits: (thanks, randman)

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Here is a thread that discusses how to change it without removing the dash: (thanks, rmac)

http://www.bonnevilleclub.com/forum/...ic.php?t=25609

Here is an article on how to fix lots of heater stuff including air mix actuator and photos: (thanks, Stan) http://trialsnuts.com/ecc.pdf
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Old 04-18-2008, 05:54 PM   #15
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Quote:
Originally Posted by smallengineguy
That must be it, then- the airmix actuator. I'll ask where it is once I remove my dash...
Wait a minute, I was just relaying my situation and that even with the system "OFF", that air would blow thorugh the floor vents at all times. In my case, my airmix actuator was broken, so I had heated air blowing at my feet, even with the system "OFF".

Before you replace the actuator, let'* step back a second, here to answer one very important question: When you do have the system operating, do you get cold air at all, from any vents? If so, then the airmix actuator is propably not broken. The airmix actuator has nothing to do with whether you get air out of the floor vents with the system "OFF". It controls the door that "mixes/blends" hot and cold air to the temperature selected/needed. Again, if you get cold air out of the other vents when the system is "ON", leave the temperature set to that same cold setting, turn the system "OFF" and see if hot air still blows out the floor vents.
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