Just getting back on line after a pause so bump this.
I have dealt with the 140 heater valve for decades and know of this issue intimately.
The linkage and cables will not line up properly to completely close the valve using the controls alone on both valves I have used in 40 years. During the cold weather, a little heat leaking by is OK. During the start of hot weather I can deftly reach under the dash while driving and close the valve completely by feel alone. During the summer I am really careful about not opening the valve with controls. The linkage does not prevent you from completely closing the valve.
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Antique Swedish Steel 71 142E color V#102
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