So I bought an R-134a kit tonight, and it said to find the low pressure access point. I think I found it, but I'm not sure. Where the hell is it? The one I found is above the passenger side front fender, a couple inches back. It's pretty much on top of everything, and has a little black cap covering it. Anyway, I hooked the kit up to it and of course the pressure was way low. I injected some for a few seconds, and the pressure gauge shot way up, above the normal range. I managed to bleed it out ( ) , but am still worried about maybe hitting the wrong A/C point. Anyone know?

 

High pressure port is a large port. Low pressure port is a small port. You can't mix them up.

 

Yeah, I found it. Charged it up to where it needed to be, but I've still got hot air coming out of the vents. Pulled the relay for the A/C as well, and then replaced it. Doesn't sound like the compressor is turning on. How can I tell if it is? And where the hell is it?

 

unless the compressor is turning when you are "charging" it won't actually charge. Put the ac on high, and then open the R134A valve to charge. If the compressor doesn't spin, it's leaked out so much that the limit switch won't let it run, and you will need to jump the wires on the back of it.

It's been awhile, but I believe with the LT1's its on the driver side top of the engine. Just follow the ac lines to the compressor, it's there.

 

I heard unplugging your battery cables for a while and then plugging them back in and then turning the AC to max and the vent control to max will allow the compressor to turn on. I am having the same problem getting my Compressor to turn on. It worked a couple days ago but since then I have depleted the system and I need to fill it again.

 

I emptied out the system (I think), and then filled it back up. No good results. I looked around today for the compressor, but there's so much **** in there I can't find it. I'm really pissed too, this is the 2nd compressor replaced since 2001.

 

Disconnect your battery for about 10 minutes and then reconnect and see if compressor turns on. It's a quirk with the system some times.

Actually, thinking about it, your compressor HAD to be running for you to fill the system with the R-134A. It's not going to jsut drain into the system. How much of the can of refridgerant did the system take?

 

Not very much. I might have put too much in the first time, so I drained it as much as I could and then brought it back up to the correct level.

 

Compressor is on the pass. side way down at the bottom.

 

Is there a fuse or something I could pull instead of messing with the battery?

 

Pull the "PCM BAT" fuse for 30 secs or so. On my 94 its in the fuse box on drivers side of the dash. Not sure if 93 is different but its either there or in the underhood fuse box.

 

I'll try that this morning I guess. Thanks, and hopefully it kicks the A/C on.

 

Living in Las Vegas I'd say that AC is a necessity. I'd take it to an AC shop and have them go over it. I don't want to sound like as A--hole but I'm guessing you're not too experienced on AC systems and if you get it wrong you can screw up some real expensive stuff. Be money well spent and you should get a warranty that will last the summer at least.

 

Not sure if misunderstood you or not, but..
In my experience it's the other way around.
Larger diameter hoses are the low pressure side, and the small diameter hoses are high pressure. The actual ports (schrader valves) should be the same size.

 

The hose only fits on one of the schrader valves. The other is too large.