Well, you can't predict anything of course. But I just renewed my a/c license and the a/c master of 40 years (our teacher) told us that an a/c compressor should never seize up if there is the correct amount of oil in the system. You did mention your a/c system was converted and perhaps the mechanic didn't flush the old oil out of the system and replace it with the correct oil. The wrong oil can cause the compressor to seize. Or perhaps not enough oil was added into the system when it was converted. When I took the compressor out of my car I pulled the compressor apart. When I removed the back of the compressor, I noticed how bad the oil was in my a/c system. As you can see in the pic, it was a chocolate brown colour. New PAG oil is very light and clear. The oil in the system looked to be original, 24 years old. My compressor was not seized, there was enough oil in the system I think. I didn't flush it properly, I just blew compressed air down the hoses on the compressor and caught as much of the old oil as I possibly could. Thinking back now I should have flushed it properly with the correct flushing agent through the hoses. But it's ok, I will do it next time. It did seem to be OK. The new compressor came with the 'generic' 180ml of oil in it, but I added an extra 30ml in the new drier and another 30ml for good measure as I don't want the system to run dry. I also added some fluro green dye into the system so if I develop any leaks down the track I can find them easily.
That's what I was thinking not enough or wrong type of oil when it was converted. Not surprising to me, this is just one of a few things that went wrong with this shop and my 30k service. Lessons learned Sent from my SAMSUNG-SM-G900A using Tapatalk
Bugger!! Ok man, it's done now. Do the job right yourself this time. If you need to know anything just ask.
OK back at, I'm ready to install the new compressor from ferrparts. I have a new dryer but need to get some orings (for 134 ) and expansion valve any part numbers for these? Does the compressor need pag oil before installing? I will try to sart on this soon since it's getting hotter by the minute here in Texas. Thanks for everyones input.
Got a question for you guys. I have a 1994 348 spider, i bought a new 134a ac compressor and filter dryer for it. The filter dryer is the identical one to the original except the pressure switch port is female not male. The pressure switch is female. I found a 2 wire pressure switch that threads in and is o-ring bossed for proper sealing. Using the original switch with an adapter I made by rethreading a 1/8"npt to 1/8" flare on one side and a 1/4" flare (I think) on the other side with shrader valve, is less than ideal as there really isn't a place for the o-ring to seal on the adapter. I'd have to braise a brass washer or something on it, which i am not set up to do. Using this 2 wire switch wouldb so much better if possible. If I tie the blue/white wire to the green black wire so that when power comes into the switch through the green wire and comes out on both blue white and green black to turn on the ac clutch and the condensor fan at the same time. Condenser fan will run all the time but every car I've ever worked on in 25 years has the condensor fan run constantly when ac is enabled. Is there any harm in running the condensor fan the entire time the ac clutch is engaged? I realize the head pressure will be lower due to the condensor constantly cooling the high side but will it be too low to function?
