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Topic: '96 Heat/AC

in Forum: C4 Cooling and Heating Systems


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'96 Heat/AC (1/5)
 5/28/10 12:38pm
DSAnderson
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Gansevoort, NY - USA

Vette(s):
1996 Collector Edition LT4


Joined: 12/28/2009
Posts: 7

My '96 recently developed a strange issue. First, I'll get the crazy part out of the way. Ocassionally, it sounds like a ping-pong ball is bouncing beneath the dash.(yeah, I know) The heat works intermittently. I'll be driving and then I'll feel heat seeping through the vents. The fan and vent position controls work, but temperature controlled by ghosts! Anyone? Thanks.
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'96 Heat/AC (2/5)
 5/28/10 1:14pm
Adams' Apple
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.


Joined: 3/18/2009
Posts: 2230

You may have ping pong balls in the system. Well, maybe not ping pong balls exactly, but there may be something floating around in the plenum area that is keeping the temp/mode doors from operating properly. Might have to do some dis-assembly to see what it is.

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'96 Heat/AC (3/5)
 5/28/10 5:35pm
DSAnderson
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Gansevoort, NY - USA

Vette(s):
1996 Collector Edition LT4


Joined: 12/28/2009
Posts: 7

Thanks for the speedy reply and the help. Much appreciated.
'96 Heat/AC (4/5)
 5/29/10 9:39am
96LT1
Former Member

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Powhatan, VA - USA

Vette(s):
1996 Polo Green LT1 Coupe


Joined: 3/20/2009
Posts: 305

The floor/vent and defrost positions are all vacuum controlled----the temperature however is controlled via a electronic stepper motor (temp. blend door motor)---the motor assembly consists of the stepper motor, multiple plastic gears and a potentiometer---the potentiometer "tells " the control head what position the blend door is actualy in versus the temperature you have set on the control head.
 
The gears in the assembly are known to break/crack with age and can make a click/clack/ticking noise and will not move the blend door smoothly/ to the correct position-- blending either heat or AC to arrive at the temperature you (the driver) have requested.  Usually IF that is the problem the control head by "looking" at voltage through the potentiometer "knows" there is a fault and lights on the control will flash/blink when the fault occurs. When I had a similar issue on mine and the noise was occuring i could put my hand on the blend door motor and feel it click/clack. The blend door motor is located inside and on passenger side and can be seen/felt (if you're a contortionist) up next to the firewall----motor is black, has a electrical connector and is about half the size of a pack of cigarettes.
 
                                                                                                        Vaughn
'96 Heat/AC (5/5)
 5/31/10 7:06pm
DSAnderson
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Gansevoort, NY - USA

Vette(s):
1996 Collector Edition LT4


Joined: 12/28/2009
Posts: 7

Vaughn,
 
Thanks. I noticed the light flashing on the temp controller and was wondering what it could be. I really appreciate the help. I won't have to wait for the Carlisle seminar to fix it!
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