Interesting data point regarding your VX not having AC and not having any cooling issues. Was your VX from California or was it a 49 state car? The CA ECU might run a little cooler.
The AC system was serviced about 2 years ago. This included a new compressor, orifice tube, dryer, etc. It seems to cycle on and off correctly. On a hot day, it would most likely be on most of the time.
I also wonder if the triple core radiator is hindering more than helping. I have heard that triple core radiators can make it difficult for the electric fan to do its job. Some favor upgrading from the single core to only a double core. This could be unsubstantiated though.
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