The area you describe , front above HWH , water valve , sounds like the Evans dash HVAC system's electronic water flow control valve ( Ranco valve ) I had to replace mine for a similar leak .
Yellow circle in photo .
You'll want to confirm the area of the leak ; rent a cooling system pressure tester ; because the Ranco valve is not cheap , $250 USD when I bought mine 4 years ago.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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