Heater box mixer door stuck?? - Chevy Impala SS Forum
 
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post #1 of 8 (permalink) Old 09-07-2012, 12:07 PM Thread Starter
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Question Heater box mixer door stuck??

Hey everyone,
I'm having an issue with 94 Fleetwood. I can't get the cabin temp to change. No heat, no cold air. The heater core lines get good and hot after the car is running, and the a/c lines get ice cold. I dropped the bottom off the heater box, and the heater core is burning hot, and the a/c condenser is ice cold. I checkied the codes and nothing comes up. I have checked all the vacuum lines and they all seem good, no leaks. Does anyone know where I can find the mixer control on the heater box? I'm thinking it may be stuck? Any ideas?

95 Buick Roadmaster Estate wagon, 95 Caprice Classic wagon, 96 Impala SS, 94 Fleetwood x 2, 81 Trans Am, 66 Pontiac
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post #2 of 8 (permalink) Old 09-07-2012, 08:31 PM
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Is there air blowing? Did you check the vacuum motor that works the temp door? You need an FSM to do the checks.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #3 of 8 (permalink) Old 09-10-2012, 04:05 AM Thread Starter
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Question

Lots of air blowing, and I have also changed the vacuum control under the glove box, and still nothing. I read that sometimes the system needs to recalibrate it's self, and it's as simple as pulling a fuse, so I did that, and it went through all the steps, and still nothing. the cabin temp doesn't change much from the outside temp.

95 Buick Roadmaster Estate wagon, 95 Caprice Classic wagon, 96 Impala SS, 94 Fleetwood x 2, 81 Trans Am, 66 Pontiac
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post #4 of 8 (permalink) Old 09-10-2012, 09:54 AM
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Assuming you get correct vacuum to the manifold, the only possibilities are; the door is stuck, the vacuum motor is not working, the linkage is broken, or it is not getting a signal from the HVAC module to the vacuum manifold.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #5 of 8 (permalink) Old 09-10-2012, 08:06 PM
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Are you getting any vacuum to the control? Check that. If not, check the vacuum check valve under the hood. I had one that was intermittently screwing up on a '95 Brougham that I had. It would cause exactly what you're describing.

2005 Pontiac GTO
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post #6 of 8 (permalink) Old 09-11-2012, 05:47 PM Thread Starter
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Thanks! Where is the vacuum check valve located, and what does it look like?

95 Buick Roadmaster Estate wagon, 95 Caprice Classic wagon, 96 Impala SS, 94 Fleetwood x 2, 81 Trans Am, 66 Pontiac
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post #7 of 8 (permalink) Old 09-11-2012, 10:43 PM
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Follow the main engine harness, you'll see the small vac line coming out. The check valve will be in the line after it breaks out of the harness.

2005 Pontiac GTO
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post #8 of 8 (permalink) Old 09-26-2012, 03:09 PM Thread Starter
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Smile Found the problem!

I found out that the mixer door is controled by an electric motor just behind the glove box. That was my issue. Thanks everyone for you help!

95 Buick Roadmaster Estate wagon, 95 Caprice Classic wagon, 96 Impala SS, 94 Fleetwood x 2, 81 Trans Am, 66 Pontiac
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