(03-07-2015, 06:59 AM)zukitrek Wrote: Hi Fix. Now that my tune up has been done, now Im moving towards restoring the A/C system in my car. I had taken the car a couple of years ago to an A/C technician and that time it turned out to be having the dryer bad.
I bought it about a year ago (also new evaporator and expansion valve) and now I want to install the whole thing
I read somewhere that you need to apply some special refrigerant oil to the evaporator.
Can you tell me what do, I need to install them properly and then take car to AC shop?
The parts must be all good, and clean, and connected and air tight, the vacuum test proves that, pump it down see if it holds for hours?
Thanks
94 has R134a ? Freon? the orig. car had 1.32 lbs of Freon, out of factory
your A/C guy knows how to match that with oil, The compressor can not run oil free, or it will seize.
the basics steps are,
new parts put in,
then is pumped down to hard vacuum.
the freon just hates moisture, so the the pump down gets the whole system dry, and the dryer keeps it dry.
then put in freon based on weight and oil to match.
the oil must match your freon. R12 or R134.?
there are some makers of oil now that claim it works on both, but i dont know. im not a loop guy.
then the system, is charged direct to a hard vacuum. by weight or using very accurate tables, with air temp and humidity outdoors.
this is the 1996 R134 pressure chart if needed. (too much 134 makes a/c weak) so more is not better.
http://www.fixkick.com/AirCond/r134-1996-chart1w.jpg
in the USA states, R12 is very hard to get, and i think 1994 was last factory year for R12.
The R22 in my home system is $100 a pound and more, 10 lbs later , 7 ton AC, , im broke, LOL
running 134 in a 12 system , the cooling will be less, the R134 has and needs more air fins and runs special expansion valve.
that is the limit of my knowledge on this...
