I replaced Fuse 14 - the lower one on the right.

As to the monovalve. If I understand correctly, ground is switched in response to the CCU.

I believe I will follow the DIY instructions for CCU re-solder this weekend and see if that helps.

Meanwhile, the AC seems to work OK at full cold past the click.

Is there a simple way provide continuous 12 v to the monovalve?

Thanks,
Mark