AC question...I know...

[Nick Triesch]

Just replaced my compressor in old carrera. AC worked before exchange, just leaked out shaft. Put it all together with new o rings then did vacuum and did not leak after a long while. Put in two cans of 134A but does not register on gauge ..at all. Added some more but still does not register on gauge and no cold air. Even changed gauge. I looked for leaks. Looked for oil. Hook ups are all dry including at the new dryer. Where could the refrigerant be going? Thank you, Nick

[Nick Triesch]

BTW, clutch works fine

[GH85Carrera]

If you pull a vacuum and can keep that all I can guess is you are leaving a hose open when your are charging the system. The very second you start to add the 134a you should see the pressures going up.

[T77911S]

how do you know the 134 went in if you dont see it on the gauges. even with the comp off you should have pressure.

if you did put it in and it leaked out that fast you should have heard it.

i would check the evap.

[Nick Triesch]

Hi. Did not hear it leak out and the can got ice cold when it was going in. The needle on the gauge just stayed flat. I know how to fill. I just filled my Daughters truck and needle went up to show that it was taking the refrigerant. On my car, with the motor running and the AC on full and clutch turning, the needle stays all the way to the left.

[Neel]

Originally Posted by Nick Triesch

Hi. Did not hear it leak out and the can got ice cold when it was going in. The needle on the gauge just stayed flat. I know how to fill. I just filled my Daughters truck and needle went up to show that it was taking the refrigerant. On my car, with the motor running and the AC on full and clutch turning, the needle stays all the way to the left.

Nick, Double check, triple check if you have to, what you've done.. I'll bet you find the problem.. If your car held its vacuum, the refrigerant should go in as soon as you introduce it to the system.. You already know that.. Sometimes we tend to overlook the obvious..

[T77911S]

are the cans empty. i take it you are removing the cans from the hoses and there is a puncture in the top. also a little 134 always comes outbecause they never complely empty.

are you using a REAL set of gauges or one of those single gauge deals you buy with a can of 134.

are you sure you pulled a vacuum on the system and not just the gauges. did you have the gauges open.

gotta ask some real dumb questions because it sounds like you may be doing something wrong.

[DaveMcKenz]

Hi Nick,
It's possible your gauge set is not completely engaging the Shrader valves on your 911. The pressure of the can may force them open, but the gauges not read. Sounds like your r134 went somewhere.
Good luck,
Dave

[Nick Triesch]

Thanks all very much but car will have to go to AC shop. Remember ,I have put in a few cans of 134A. So after much checking and searching I have found there is no pressure on the low side and a ton of pressure on the high side. This tells me that there is something very wrong in my system. A blockage maybe? Anyway, I thought it was going to be an easy fix because it did work before I swapped out the compressor. Just had a good leak out of the nose seal. BTW, I do have the set of gauges. That was how I pulled a vacuum and found the system did not leak. Nick

[DaveMcKenz]

The "ton of pressure on the high side" is not mentioned above, and would have led to entirely different comments. That would have been good to know from the beginning. Glad you figured it out.
Dave

[Bob Kontak]

Originally Posted by Nick Triesch

Thanks all very much but car will have to go to AC shop.

You know you can flush the system yourself and replace the expansion valve and R/D for about $100. Maybe $150 with cleaning agents. Downside is many hours of real work.

This is going to push a long one. $1k Ouch.

[Neel]

Originally Posted by DaveMcKenz

The "ton of pressure on the high side" is not mentioned above, and would have led to entirely different comments. That would have been good to know from the beginning. Glad you figured it out.
Dave

Yes, this would indicate a blockage in the system.. However I would expect to see a vacuum reading on the low side gauge.. Look to see if you can see a 'frost ring' somewhere.. Could be an indication of the blockage..

[DaveMcKenz]

Originally Posted by Neel

Yes, this would indicate a blockage in the system.. However I would expect to see a vacuum reading on the low side gauge.. Look to see if you can see a 'frost ring' somewhere.. Could be an indication of the blockage..

Right, Neel. I don't think we are getting very complete information, so I think the OP taking the car to a pro shop is indeed a great idea. I don't think we'll know what was wrong even after that. Kind of a waste of time.
Dave

[Bob Kontak]

Originally Posted by DaveMcKenz

I don't think we are getting very complete information..........

Pieces and parts of info, agree.

I can't tell Nick what to do as I incorrectly assume folks have the same mentality as me.

Recommendation. Flush, R/D, expansion valve.

[DaveMcKenz]

Originally Posted by Bob Kontak

Pieces and parts of info, agree.

I can't tell Nick what to do as I incorrectly assume folks have the same mentality as me.

Recommendation. Flush, R/D, expansion valve.

I know, Bob. He says he has a full set of gauges, otherwise he wouldn't be able to vacuum system. He charged his system and reported essentially zero low side pressure. Even though the high side was hooked up, he did not mention that it had "a ton of pressure". There's not that much to look at on a set of a/c gauges.
Anyway, if he knew every question to ask, he would probably almost have his answer. Lots of people don't know what information is important.
Glad he finally figured out that he needs pro help.
Dave

[Ronnie's.930]

Nick, did you possibly leave one of the shipping plugs inside the high or low side spouts by accident (usually there is a cap, but sometimes a plug is in there as well), or maybe accidentally left a piece of rag or something you might have used to plug the hoses when you unhooked them to install the new compressor?

Don't mean to sound insulting by asking something so basic, but people have done that, or worse (rags left in oil hoses, and so forth), and it did not dawn on them until someone asked the questions.

[Neel]

Originally Posted by Bob Kontak

Pieces and parts of info, agree.

I can't tell Nick what to do as I incorrectly assume folks have the same mentality as me.

Recommendation. Flush, R/D, expansion valve.

Originally Posted by DaveMcKenz

Right, Neel. I don't think we are getting very complete information, so I think the OP taking the car to a pro shop is indeed a great idea. I don't think we'll know what was wrong even after that. Kind of a waste of time.
Dave

You are both correct.. My hope is the OP will find an A/C shop that is familiar with our P-Cars.. If not, big $$$$, poor results..

[Neel]

Originally Posted by Ronnie's.930

Nick, did you possibly leave one of the shipping plugs inside the high or low side spouts by accident (usually there is a cap, but sometimes a plug is in there as well), or maybe accidentally left a piece of rag or something you might have used to plug the hoses when you unhooked them to install the new compressor?

Don't mean to sound insulting by asking something so basic, but people have done that, or worse (rags left in oil hoses, and so forth), and it did not dawn on them until someone asked the questions.

Right, Ronnie.. That's what I was trying to say in post #6..

[Nick Triesch]

Hey Dave, I thought I was pretty clear of what was wrong with my AC. Go back and read it. OK, I forgot about the high pressure on the high side. What a jerk.

[Nick Triesch]

I'll go back and check everything. Thank you. Wow, for a minute I thought I was back with the 356 crowd. Now those folks are snoots.