Heat blowing cold + flashing heat controls after 20 sec - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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 02-06-2007, 10:24 AM   #1
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Default Heat blowing cold + flashing heat controls after 20 sec

I have read a couple of threads about this problem but cant seem to find a clear answer. I have a 94 SSE. I had my alternator and 2 days (car set) later battery replaced. When I drove the car after the alternator being replaced and again after the battery was replaced I noticed that my heat display flashes for about 20 sec after I get driving and the heat starts blowing cold.

I read through this forum
http://www.bonnevilleclub.com/forum/...6213dfb4d0a7da

cause he seemed to have a very similiar problem. I was going to check the ECC codes to see if they needed to be cleared or something but not sure how to do that on a 94sse. I guess I can look in the glove box to see if that thing(what is the name) moves and I guess if it dosent means that the little plastic gear is broken.

Could someone just point me in the right direction.

Thanks!
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Old 02-06-2007, 11:03 AM   #2
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You cannot check codes yourself on a 94, and you are going in the right direction. Open up that glovebox and check to see if your airmix actuator moves.
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Old 02-06-2007, 11:07 AM   #3
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Ok. I am going to check that around lunch today. Thanks!
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Old 02-06-2007, 11:23 AM   #4
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When you come back to tell us what you found, can you update your profile to show your year and model in your signature? It'll help us to help you.
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Old 02-06-2007, 11:28 AM   #5
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Here'* the direction I'll point you...

http://www.bonnevilleclub.com/forum/...sc&highlight=A

Here'* a quote from that thread, but there is much more info in there.
Quote:
The ECC flashing is a sign that the system has detected a failure.

If you can control where the air is coming out of (center vents, defrost, floor) and the only issue you are having is hot vs. cold, and you can see the rod from the airmix actuator having trouble when being driven to the left or right, your problem is either:

1. Failed Airmix Actuator (probably a broken drive gear in the acuator).

or

2. A binding airmix door (haven''t heard of one yet, it is usually the actgator gear)


Hot and cold are controlled by the air mix actuator driving the airmix door to blend hot and cold air thorugh the system. The airmix actuator is completely electronically gear driven. No vacuum is involved.

There is a recalbration procedure to insure the actuator rod is positioned properly on the airmix door connector (the white piece that the rod pops into that you can see through the hole in the glovebox), and occasionally this has been used with sucess.
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Old 02-06-2007, 11:58 AM   #6
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Quote:
Originally Posted by lash
your problem is either:

...1. Failed Airmix Actuator (probably a broken drive gear in the acuator).

or

2. A binding airmix door (haven''t heard of one yet, it is usually the actgator gear) ...
"Actgator gear"?
You have the classic symptoms of a cracked 'gator gear. For some reason it starts to manifest itself after a battery disconnection.

When you watch your actuator you'll probably see the programmer try to calibrate...it will attmept to drive the door full cold (to the left of the car), then full hot (right), then it will settle in someplace between based on the temperature setting. Set your temp to max heat and watch the action. Set it to max cool & watch. If you see any hesitation at all during movement, the actuator gear is slipping on the shaft.

Let us know what you see.
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Old 02-06-2007, 01:23 PM   #7
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lash thanks for the directions. Went out to the car and looked all through the glove box after taking it out and I could not see anything that resembled the actuator. I will check under the dash.

Thanks everyone for your help. Its really cold here in DC and no heat Sucks! I just replaced my stupid blower motor about 3 weeks ago.
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Old 02-06-2007, 01:26 PM   #8
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lash,

Where do I look under the dash to find when I am adjusting the heat?
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Old 02-06-2007, 01:34 PM   #9
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http://www.bonnevilleclub.com/forum/...ht=redneck+fix

The first pic in this topic will show you the hole to look through after you take the glovebox inner liner out.
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Old 02-06-2007, 02:14 PM   #10
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This thread that lash said I should visit said it is under the dash for a 94 bonneville.
Is that wrong. I looked the glovebox and didnt see anything
http://www.bonnevilleclub.com/forum/...sc&highlight=A
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