2005 Lincoln Town Car AC recharge problem

The Derfer wrote in news:0cb9954d-71e0-4103-91b0- snipped-for-privacy@q40g2000prh.googlegroups.com:

You don`t have enough refrig in yet, that is why the cycling. you need to find some one that knows what he is doing if this confuses you. it is too complicated for your knowlage. KB

When the pressure goes down to 15, what is the high side pressure? You may not yet have enough gas in the system, or a plugged expansion orifice. I'm betting on the former. And do you have any idea what happened to the gas you're having to replace? If you have a leak, adding more 134a is just being wasteful. I suspect you have a slow leak somewhere.

What's happening is that the compressor clutch is engaging, and then it's being disengaged when the system pressures don't come up properly.

This could be because there is a clog in the system, it could be because there is too little freon in the system, or it could because there is too much. Or maybe a pressure switch is bad.

You need to be able to measure both the high and low side pressures in order to make a real diagnosis.

--scott

It sounds like you don't have enough freon in the system yet, but I've also seen where too much freon causes this problem too.

Did that can of EZ chill have a stop leak built in?? It's possible your orifice tube might be clogged.

The can does feature stop-leak, for whatever that's worth.

Now I've emptied the rest of the can in there. The pressure goes up to 55 psi, clicks, goes down to ~15, then goes steadily back up, repeats this over and over. I don't have anything that will fit the high side to measure that.

That's not good.

Well, get a real gauge set or take it to someone who has one before you wind up damaging the thing.

--scott

Or killing yourself. Messing with A/C systems can be dangerous if you don't have the right tools and know what you're doing. And it appears you don't...