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Need advise

Gerald K4NHN on Thu June 25, 2009 5:58 PM User is offlineView users profile

Year: 1983
Make: Isuzu
Model: PuP
Engine Size: 2.2
Refrigerant Type: R-12

I replace the compressor and drier on my Pup about 6 weeks ago. It has been doing well other that I don't know if the evaporator may be freezing up on trips. It seems that or it's filling up with water and then the air goes to almost nil. Cutting it off doesn't seen to make it start back up, but as soon as I stop and look under the hood and mash the water drain tube, it starts pouring lots of water. But I know that there nothing in the evaporator box, because I had it apart on the rebuild and I had it spotless inside..

Anyway to the problem at hand. I went to a meeting the other night and as soon as I pulled up to the parking lot, a large puff of smoke came out of from the hood and I just thought that's odd, but the Pup is a diesel and maybe the wind just blew the exhaust back to the hood area. When I pulled out I noticed that the AC had quite. I just turned it off. At home I notice that the condenser had sprang a leak at the top and has a pin hole in it. It still had a little pressure in the system. I added a small shot of R-12 to see where it was at. A new condenser for this model PuP isn't to be had or I would buy one. It has flare fitting and they started to use o-rings in 1984. I can get those condensers.. I even have a trooper condenser that is the same mounting but they also are o-ring fitting.

I took the old unit to an old AC shop and the guy does heliarc welding and he was able to fix the pin hole with no problem and pressure tested it also.. I don't know to what pressure but being an AC guy he knows about the pressure that it should take...

I really don't want to have to take the compressor and the evaporator off and drain the oil. The manual said that the unit takes 5 ozs and that's what I added on the rebuild. It also said if the condenser is replaced to add 1 oz of oil and not to add more than 2 oz for any replacement of either the evaporator, or condenser, or the drier, because most of the oil is in the compressor. With the mass exit of the gas it did take oil with it, but I don't really know how much. Since the system still had some pressure on it and the whole system had only about 500 miles use, I plugged off the open lines as soon as I opened it trying to keep any moisture out of the system so I could still save the new drier I had just put in.. I had to order it also from Tim because it's also flare fitting and they're hard to come by. So your thoughts about how much oil to add back and do you think I can still use the drier.

Gerald K4NHN
Cayce, SC condenser a.jpg

TRB on Thu June 25, 2009 6:57 PM User is offlineView users profile

I can't imagine you lost more than an ounce. Direr should still be good if you just had it open to repair the condenser. Pull a good vacuum on it before charging and you should be fine.


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Gerald K4NHN on Thu June 25, 2009 10:25 PM User is offlineView users profile

Thanks Tim, I'll flush out the condenser real well, add the oil back to the condenser and put it back together and pull a good vacuum and go from there.

Gerald K4NHN
Cayce, SC

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