With the compressor running, does the low side line (with the fitting by the valve cover) get cool or cold? If so, Freon is flowing. Do you have gauges to attach and see what pressures you have?

The monovalve needs 12 volts to close. It's default position is open, allowing hot water into the heater core.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D