Anyone know where low pressure port for AC is?

I have a leak somewhere and need to figure out where it is. Figure I'll add some refrigerant with the dye in it. I saw a port on the left side by the alternator but wasn't sure if that's what I need.

TIA
-Rick

The low pressure port is a different size than the high pressure port.
So, if you have the correct hose to fill the system it will only fit the low side.

I think the low pressure port is the smaller one.

Rickw wrote:

The low pressure port is a different size than the high pressure port.
So, if you have the correct hose to fill the system it will only fit the low side.

Good call. I figured it was that way but wanted to make sure. If memory serves, Aaron is right. The low pressure one is the smaller port. I'll find out tomorrow.

Being you...I nearly gave the Regal answer.

Most H/G body's have it right by the passenger motor mount in front of the water pump. High side is usually closer to the strut tower in the same area. Low is the smaller of the two fittings.

If you need a hit of freon or a little diagnosis and don't mind the cruise to Enfield.. I've got a full set of gauges and about 15lbs left in the tank.

LOL... I finally got me a non w-body L67.

Might take you up on the offer. I tried to recharge the system a few weeks ago. It took the whole can but I got no AC out of it. Thinking the AC compressor might be shot because the clutch isn't engaging.

Was it holding any pressure at all?

Did the system actually take in the freon? Was the system completely empty?
If the compressor isn't working you generally won't get it to accept any freon.
The clutch won't engage if the system pressure is still low. There is a low pressure safety switch in the line to detect low pressure and disengage the clutch so you don't fry the compressor pump.
The can of freon you attempted to add may not have actually entered the system. Did you notice it get lighter in weight? You still may need more freon to satisfy the low pressure switch, although usually one 12 oz. can will be enough to get the clutch to come on, then you would need to add more to fill system if empty.
If Bill is available to diag. the system it would be a good idea, could be many things in addition to the leak that must exist for it to lose the freon in the first place.

It took the whole can and I didn't see any leaks (to the best of my knowledge). The addative has stop leak and leak detector in it (in other words, it was bright so you couldn't miss it). The hookup hose I have is ghetto and doesn't have a pressure gauge so I'm not sure what is in the system right now. The bottle I used was quite small; I'm not sure if it was 12oz. If the system is completely empty of all freon, something tells me that I have a decent sized leak somewhere that I didn't see.

I'll give Bill a holler soon and hopefully he can help me get it sorted out.