A few weeks ago I completed the install of my AC system on my V12 107. When I first charged it it was 70°F ambient and I was getting duct temperatures of 42°F. A week later it was once again 70° out and I'm getting 55° Duct temperature. With the only real change being I got the aux fan now working and installed a electric fan controller that turns on the radiator fan anytime AC is on. Gage pressures have since gone down with the new fan controls from about 275 high side to 225 and 35 to 20 on the low side running at 2000 RPM.

I was suspecting a leaking monovalve. I grounded the brown and white wire on the monovalve to make sure it was closed at all times and no change. But I did notice the output line of the monovalve to the heater core does get warm, not as warm as the radiator hose but it is warm and I wasn't sure if that was normal. Should the monovalve seal of completely tight or does it allow some water to pass.

I hate to try a new monovalve because the only ones now available are MTC aftermarkets and I and many others have had a bad experience with.

This is a bastard system using a universal condenser and running R134. But it seemed to work really well for a moment.

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John Roncallo