Automotive Air Conditioning Information Forum (Archives)

ghiotom on Fri November 20, 2015 10:24 PM

Year: 1996
Make: Jeep
Model: Grand Cherokee
Engine Size: 5.2 L
Refrigerant Type: R134A
Ambient Temp: 80
Country of Origin: United States

After replacing the liquid line in my Jeep, I was having a very difficult time getting a charge into the system. Then i noticed the liquid line to the right of the low pressure port was frosted over, but not to the left of the port. Does this indicate a restriction? I think that something might have blocked the tubing in the process of brazing on the port.

GM Tech on Sat November 21, 2015 9:01 AM

Yes- restricted- but that must be the high side port- since it is on liquid line- ahead of the restrictive device (TXV or OT). I assume you are charging out of cans- on low port- But your liquid line is barely open- must be a weld issue when high side port was attached in manufacture- Take it back, get another liquid line.

Also would be good to reduce your camera resolution- photo is too big to get a good view without scrolling.

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Sat November 21, 2015 at 9:03 AM by GM Tech

ghiotom on Sat November 21, 2015 9:45 AM

Thank you GM Tech. Yes, charging by cans, but I did manage to get some in by liquid into the high side after vacuum. Tried to get the rest in by gas through low side but almost nothing was going in. By the way, that is the low port, between the orifice tube and the inlet to the evaporator. The orifice tube is crimped into the line and the whole liquid line must be replaced when replacing the orifice tube.

Dougflas on Sat November 21, 2015 6:23 PM

there are kits thst allow yu to cut the orfice out and use an adaptor and a replaceable orfice.