I turned on the AC earlier today and after turning it off there is a hissing noise coming from the HVAC panel. Anyone know what this might be?
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I turned on the AC earlier today and after turning it off there is a hissing noise coming from the HVAC panel. Anyone know what this might be?
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you need a rebuild kit for it most likely
+1
The mode switch diaphragm is a known wear item.
A. Read the DMCH Knowledge Base article about what failed (the rubber diaphragm).
B. Buy and install one of these Mode Switch Repair Kits.
The kit has detailed access and teardown/rebuild instructions.