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The newest 240 I have is a 1988, R-12. There are no ports in the system except for the two on the back of the compressor.
Anything on the receiver/dryer that looks like a port is not. Note that this unit is mounted on the right end of the radiator.
A Volvo with the large coffee-can sized receiver/dryer mounted near the right side firewall is different. I have a 1997 965 with this layout. There is a port at that location and it is on the low side. I have used it with success.
The compressor must be running.
A shop might have the equipment for adding refrigerant through the high side that will handle the high pressue safely, but I don't know why they would want to do it that way.
Good Luck,
Bob
:>)
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