Problem solved
Hey all.... finally got it, after mucho dinero.
Analyzed system drawings and deduced that inadequate airflow over coil was causing overheating. Traced all parts and cables and found that the front engine pressurized air temp control runs two cables, one to the diverter for air in the face above the controls, and one to the inlet valve at the pilot's toe in the firewall. This cable had come off the panel control. When the valve remained in the "warm" vs "hot" position, forced cabin air bypassed the heater coil, therefore the coil was not getting ariflow and overheated.
So now I have a new heater, and every part and control is new or OH as well. Not bad for a 20 year old plane to have a new combustion heater. Too bad it wasnt really necessary. Such is life.
regards,
I'll fly warm again.....
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