If your WoT 2-Way Valve mounted on the firewall is faulty and you need a dirt cheap replacement: use the A/C valve underneath the water-tray under the bonnet... it's the same part. That is if your A/C is not working of course. Mine didn't so I just swapped the two! Regards, Maurits 1986 GV (Swiss WR) 1985 CGT KV 1982 GL DD