Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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HVAC CONTROL ASSEMBLY REPLACEMENTREMOVAL PROCEDURE
IMPORTANT: Do not bend the mode and temperature cables.
NOTE: Refer to Fastener Notice in Service Precautions.
Tighten Tighten the screws to 1.9 N.m (18 lb in) .
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I trust that this is the information that you need (If it is not clear from the information, the HVAC module and the control board for HVAC are one in the same). If you have any further questions, please let me know, I'm happy to help. If you were satisfied with my service, please remember to take a moment and rate my answer using the star rating system above. Thanks so much and Happy Thanksgiving!
Ok, I think I understand, you are talking about the air distribution box?
That should be fine, I will help any way I can...
Once you have removed the dashboard, it is not very difficult to remove the evaporator. You must first, however, evacuate the a/c system and remove the a/c lines and the heater core lines. Once this is done and the dash is removed, there are only a few nuts that hold the air box on (these nuts are removed from the firewall on the engine bay side). When you have the air box out you simply unbolt the two halves and take out the evaporator.
As far as your hissing sound, I assume that it is a vacuum leak, but that would need to be pinpointed while it is running.