N.E.Ohio Bob

Got a chance to look further at the heater control on my brother's
Accord today. The heat control **** was only moving in the center 100
degrees of arc instead of the complete 180 degrees.
I disconnected the control cable at the water valve, and all things
returned to normal. I removed the glove box door and could see the door
linkage working as designed.
I am going to replace the valve next week, unless someone out there
thinks my diagnosis is faulty.
Thanks! bob