Hi. I'm getting ready to evacuate my AC system with a vacuum pump. I've got the high and low side gauges hooked up, and the vacuum pump hooked up to the 3rd hose, and everything open. Is that all I need to do, before turning on the pump? The instructions for my gauges say something about opening up the discharge and suction service valves on the compressor. But, I don't see any valves on the AC compressor.

Perhaps that doesn't apply to my 93 Honda? Any advice is appreciated.

-Emery

 

both valves are generally found in transport refigeration units. just open up your hand valves put in a vacuum and that should be fine. but you shouldn't use a vacuum pump to evacuate system, cuz all it does is vent refigerant into the atmosphere. it is harmful to the environment and illegal, but i've done it a few times.