I have a mixing box problem on my IV-P which is new. On a recent flight I pulled the cabin heat knob on in the plane, and got heat as expected. When comfortable, I pushed the knob back in to the normal “heat off” position, but the hot air kept coming in. After the flight, decowled the plane to inspect, and all cables and hoses were still hooked up and operating (the lever arm on the front of the box moved normally with someone in the cockpit pulling and pushing the knob. I took off the hot side inlet hose and poked a flashlight in there. It appears that the rotating opening in the disc that rotates between the hot and cold sides was no longer rotating with axle activated by the pivot arm.  Has anyone else seen this? How easy is it to get into this box, and am I likely to find anything fixable? I can manually nudge the disc into the “cold only” position and leave it there, sort of defeats the purpose…

 

Doug

 

Douglas W. Johnson, MD PA

Lancair1@bellsouth.net

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