Hey everyone,

I have a 2005 Ram 2500 Diesel and I just put a new A/C compressor, Drier, Accumulator, and all new Lines on the truck. I am having issues with the liquid line leaking at the firewall where it goes into the heater core. I have tried taking off the liquid line and re-seating it. I hear the click when it goes in and the retainer connects just fine. When I put a vacuum on the line it does not hold so I put a little freon in it and could hear and see it coming from the liquid line connection. Not sure why with all new lines this is happening? Do I need to replace the heater core as well? Not sure why that would be needed but any advise would be helpful.

Thanks,

Ken

 

I have a 05 also, my liquid line was leaking behind the batt. I got lazy and did not want to replace it so i sanded the line and put some 2 min epoxy over the pin hole...three years later still working!

 

oh lord you two are killin me...

a/c has nothing to do with the heater core. that is the evaporator you are dealing with. and without the truck here in my garage hooked up to the machine I'm no help.

 

Yes you are correct that it is the evaporator. Excuse me for typing fast in an effort to get a fast response. I have tried putting new o-rings on the liquid line but the leak still remains.

 

try a new set of o rings. sometimes they lay around the supply house too long or are the wrong material and tend to shrink, etc and leak. The location may be part of the problem as it's hard to get to. Or if you are like me just get some dynamite and blow the danged thing-up. My problem is a little more severe in that the low side pressure is high and the high side is a bit low. compressor and condenser fan running fine along with inside fan. It is about 62 low and 260 high at 93 F outdoor ambient with an inside discharge temp of around 78 F. I figure there is a restriction in the liquid line restrictor maybe caused by moisture or dirt. the manual says its not field servicable and that the liq line must be replaced. I think I'll try evacuating with a vac pump to boil off any water inside the system before replacing anything and report back later with the results. There are 2 screens in that restrictor as well and either could be clogged although this isn't likely as the system is sealed and no dirt can enter. the system has always had a positive charge although low during the winter this past year. I assume it may have come on during defrost at some point and went to negative pressure on the low side pulling in some moisture. I have several degrees in engineering and a/c & refrigeration service and this is a rather common problem. Will let all know how this works out. If I have to replace the restrictor does anyone know if there are aftermarket available? On building units I've cut these things down and removed the screens and brazed back up so I could reuse the restrictor/filter. no idea if that's possible on these though. the manual just says replace the whole thing. Any info on this would be appreciated. Thanks. And good luck with that connection/leak.