You must convert the system over to R-134a. Don't try to put in R-134a into a R-12 system. That's a no no. Your compressor will certainly not last longer than a week.
R-134a system is a whole new system, new compressor and lines.. ect.. My A/C is cold as hell and I mean cold. Solid ice baby. Go to target pick up a recharge kit with the gauge already on the unit itself. Inexpensive bottle, will fill up your A/c if it isnt that cold. It will also read the PSI of the low side line. Also will indicate a problem if there is one.

 

Sounds high to me. Find out what he's doing there. Compressor should be about 300, dryer 40, refrigerant 50 and labour about an hour at 75ish. I make that 465 as a rough guess.

 

i guess recharging a bit w/ r134a is good, but i guess if we had to COMPLETELY refill or charge a system, oil is needed.

even my manual suggests to use a specific oil, but it doesn't say for which application.

so basically anything with a guage then? or will it be better to buy a RETRO fit kit? and save the fittings just in case?

my system is cold and i dont think i have any leaks, even the technician above said, a system shoulnd't need charging unless a leak is present. so im not in a rush to try this out. but checkers has a retrofit kit on sale.

can someone confirm the r134a/oil thing? i would think a system that is cold, needs just a bit of r134a alone cans in it, while a system that has lost most of it needs the r134a/oil cans?

 

Shop wanted $500 for compressor, $50 for drier,$50 for refrigerant and $200 for labor. I told him NO THANKS!

 

What happens when you over charge your AC system ? Can that be done using the little cans from AZ. My compressor makes a whining noise above 2000 rpm, also seems compressor is no kicking in & out. It blows super cold air after I added a can. Seems to be too much pressure maybe ???? Can I just bleed some off?

 

I have the same noise, its starting to go away, you did over fill it. best way to remove some pressure from the system is to put back on a container or
R-134a and let some of it go back into the bottle.

 

I did have the a/c papers with me at some point. I got them from ALL DATA. It listed what PSI each line should be, What type of oil, How much freon to add in.. ect ect.. If I can get to the computer lab again ill print one out.

 

I have no container, what if I just put on the gauge or push the little valve some?

 

Its highly not recommended to do this but.... Wear gloves, Safety glasses, an air mask and a long sleeve shirt. Make sure you have water near you and a rag to clean up the oil/freon that might go all over the side of the engine. Be very careful.