Yeah I chased that rabbit a few years ago as well. VA sent me a new style valve. I’ve even installed a manual block valve ahead of that and closed it off.
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Originally Posted by Bad Bowtie
Just throwing this out there as another thing to check... is the heater control valve flowing the correct way and wired correctly if I recall they have a directional arrow on their valves for recommended flow direction. Also think they used two different valves over the years depending on how old your system is. Hopefully you not getting a mix of hot water in the heater core at the same time the a/c is running through the evaporator core.
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