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Results are in for the moment. It is not the monovalve because I completely blocked it off. I took the line off and plugged it. 60° duct temp with the monovalve blocked off.
Interesting results with a stock 560SL this morning. The stock 560SL with R12 charged 3 years ago. I turned it on high blower temp came down to 46°, low blower temp down to 36°. Checked the monovalve hose and it was cool. Turned the heat on full to open the monovalve. Monovalve hose got hot. Tuned the AC back on again high blower, couldn't get the temperature below 54° and about 44° with low blower. Monovalve hose remained reasonably warm. It might have gotten better if I let it run for a while but it takes a long time to cool down that heater core. Apparently monovalves do have some leakage, at least 3 year old ones do.
So the modified 560SL also is a little cooler with the system plugged but not much.
I'm getting a little concerned that possibly I did damage to the system when I installed the aux fan. My first install had the fan spinning backwards canceling out what the radiator fan was doing. I drove the car about 5 miles before I realized something was very wrong. AC would not work at all, coolant temp was running high. High side pressure probably tripped the 390PSI pressure limit, assuming the switch worked. They are new Behr switches but I am able to tell that the fan pressure switch, is supposed to turn on the low speed aux fan at 290PSI is turning it on at 230PSI, so maybe the compressor cutout switch is also off. The system has been compromised ever since I ran with the aux fan backwards.
In any case I will leave the mono valve plugged to take it out of the system until I get this sorted. I will have to wait until my recovery system comes in to do any more with charge.
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