Pressure relief valve just doing its job?

[NYIntensity]

So the other day after charging a dry system w/ R-134 (I'm assuming it was dry, because when I put on the R-134 conversion on the low side, I barely got a 'pfft') I was driving around in some fierce heat (90+, its a black car), when a turrible (read in your head as though Cleveland Brown was saying it for added effect) amount of steam came out from under the hood; I looked and saw that everything was flowing from the pressure relief valve.

Are these a one-time-use kind of thing; do I need one that will handle higher pressure (I'm cautious to do this because I'm not sure what the OEM piping can handle), should I just get a few more cans of R-134 and recharge, to a lower pressure? I used one of the DIY kits, and filled it to the higher end of the "green" pressure zone.

Thanks for any input guys.

[corn322]

Out of the pressure relief on the compressor? I don't think they're a one time deal, but I have had them pop when filling a car 'cause they where old. Get a new one from your favorite auto parts store.

If you have access to a vacuum pump hook it up and let it run for a half hour or so, then fill it back up. If not, I guess take it somewhere to be vacuumed.

[NYIntensity]

Yes, out of the pressure relief on the compressor. Why does it have to be vacuumed? I'm assuming all the pressure left the system; when I turn it on there's nothing but hot air.

Thanks for the response!

[corn322]

Put a vacuum on it to get all the air/water out of the A/C system. It's designed to work with refrigerant, not refregerant with air and moisture mixed with it.