shadowknight

I evacuated the AC system then added one can of R134A with both valves open. Lucky for me the can did not explode the question is. Do I need to evacuate the system again?

SteveG

"values" I think you mean valves, meaning the contents did not go into the system, but straight into the atmos??? Something, either air or a portion of the 134 went into the system, probably no liquid, just gas. Then presumably you closed the valves. What pressure are you reading now? I would start over, pull a new vacuum.

AO

I wouldn't think so.

dr bob

Was the compressor ever running? One can usually isn't quite enough to set the pressure safety switch.



Some thoughts:

I charge systems with the engine off and cold. Connect to the system with the charging hose(s). Purge the air from the hose(s) after connecting the refrigerant can. Just a little. Flip the can up so that the valve is at the bottom, so that you charge with liquid. Open the valves to let liquid refrigerant flow into the system. Warm the can with your hands, or --maybe-- a little warm water in a bucket if it's a warm day. The heat from your hands will cause the refrigerant in the can to expand, and push into the system. Since the liquid is flashing in the system rather than in the can, it won't take much body heat to get the process going. Put the correct amount in by weight, and close the valves. Let the car sit for a bit to make sure there is no liquid remaining in the system, maybe ten minutes to be really safe. It's about the amount of time it takes to put your tools and toys away. Start the car and run the system. Charging this way takes minutes rather than an hour or more.

If you have the Morehouse CD set, look in the AC service manuals to read Porsche's description of this same method.

shadowknight

Steve your right I can't seem to multitask well at work.... I did mean valves. I am using a Harbor Freight A/C manifold kit and did not realize the high side plastic **** is cracked. So the valve was not closed when I started to add the refrigerant on the low side. After a few minutes of the compressor not engaging I noticed my mistake. Both high and low were at 100PSI

shadowknight

Dr.Bob thanks for the advice, I will give it a try with the engine off and cold.

WallyP

If I understand your question, there is no problem with putting refrigerant into both high and low side AS LONG AS THE COMPRESSOR IS NOT RUNNING. One 12-ounce can will normally not trigger compressor operation, and even it it does, putting the 12 ounces back into the same can won't blow it up.

I charge the same way that dr bob does - liquid into both sides.