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The compressor must be 'running' to add coolant. Usually, there is enough pressure in a can to trigger the pressostat and get the clutch to engage.
Just make sure that you shake the can first. Then screw the can to the line, but not too hard - just snug. Turn the handle down all the way. Engine running and AC switched on, connect the hose to the valve, and open the handle all the way up. Then turn the can sideways, the top part should get very cold if the gas is flowing. Near the end of the can, turn it upside down to get the rest. Close the can, unplug it from the car. The clutch should not be cycling at idle and both lines should be getting very cold.
Klaus
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Always willing to listen, just not able to take direction.
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