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I'm not sure why my Griffiths system is not performing the same way your systems are. I too replaced everything but the front and rear condensers. After a reputable Auto AC shop was tasked with the initial charge and was unable to get more that 24 OZ of refrigerant in before pressure dictated it was full, (leaving me with very unsatisfactory vent temps) I took it to another shop. This guy was even familiar with the Griffiths system. He put the system on a vacuum for a number of hours and then left it over night to make sure there were no leaks. He was able to get 32 oz's of refrigerant in before pressures dictated it was full. Griffiths says to start with 36oz but you cant argue with the gauges. Things are definitely better now but nothing like the results you guys are getting. If the car's been sitting in the garage overnight I will get vent temps in the mid 40's and it's awesome! If my drive is more than 30-40 minutes, the vent temps start to climb. In a matter of 2 minutes or so temps will go from 45 to 60 and once it hits 60 or so, it begins to drop right back down to 45-50. I know most are thinking the evaporator is freezing but this cycle of 45 to 60 and back to 45 only takes about 2 minutes in total and I don't believe the freeze and thaw would occur that fast. This cycle will repeat itself indefinitely every 7-10 minutes.
The other issue is heat soak. If the car sits in the afternoon sun to the point of heat soak it will take ten or fifteen minutes to get vents temps down to the high 50's low 60's and it never really gets better than that until the car completely cools down in the shade and sits for a few hours. All this having been said, it is certainly better than having no AC at all but it's not what I had hoped for or expected. I do have one theory and I'm wondering if perhaps there is a blockage in the system? I had instructed the first shop to flush the front and rear condensers before they started to charge it but they never did and I'm thinking that may be it. Not sure but I may have to start from scratch with the flush and re-charge. I am certainly open to suggestions if any one has any.
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