Heater Control Valve

We were advised to purchase a heater control valve for our 1972 pre L from Napa. With minor modifications, it installed OK. The AC worked for awhile and then quit, only blowing hot air. My mechanic pinched the water line to prove the AC system was functioning properly and confirmed the heater control valve must have a slight leak. He states it's a poor design (big surprise) and wants to know if anyone has solutions other than just buying another Napa heater control valve. Thank you
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