A/C completely rebuilt...R12 or 134????

[sblake01]

Trust me when I tell you this (I'm a licensed HVAC/MVAC tech): You'll destroy your designed for R12 system by running R134a in it. It's not just the dryer or the oil. There are other components in an R12 based system that are not designed to run at the pressures that R134a requires.

[cali260Z]

Thanks Sblake, i knew you wouldnt steer me wrong, so i had some time today to jump on the net a googleded freeeeeze12..................... and BAM!! Johnsons freeze came up, it gave me a list of LOCAL peeps that are or were distributers,

guy #1 stopped selling it cuz everyone that wanted it was in el cajon and he was in vista(40 mi away) not cost effective

guy #2 is a mobile tool salesman guy and guess what???? he had some, a bunch of it !! so we met up in rancho bernardo shook hands and it was a done deal:cool:

so long story short, 2 cans= 24 Oz plus a can of the oil 4oz.= 28 oz total 21 bucks no tax, the sticker under the hood says i need 30 oz. of r12 sooooo i should be golden;)

Guide me along here sblake, should i evac the system and then add the oil then a can of the freeze12 or should i just "drop" it in as they say

if i were to guess it would be far better to evac out the old oil add the new oil and then the freeze12. and dont change out that dryer? or leave it lie

[sblake01]

There's likely still R12 (or whatever refrigerant) in your system since you say the compressor clutch locks in. I would recover the old refrigerant and pull a vacuum on the system. From there I'd add the oil first the as much Freeze 12 as needed but I'd use my charging manifold. I don't like charging a system without knowing the actual pressures. I have the equipment to do all of that, however. The average person doesn't. I actually would leave the dryer though you may get differing opinions on that. Too bad you're about 85 miles away. If you brought the stuff up here, I could set you up as I have all of the necessary tools. BTW, it takes all of my restraint to not ask about that last picture:)

Edited April 23, 2009 by sblake01

[cali260Z]

i put that 1 in by accident;) she sure has BIG titties huh?

i may be able to fanagle a evac from 1 of the local .....repair shops;)

i could go to harbour freight and p/u a gauge set but i dont know what to look for in regareds to pressures

but i may be able to run up your way next weekend

Sat. i have a family party in SD

and sunday i want to head up to OC for the car show sponsored by motorsport.com

[sblake01]

If you could come up next weekend that would be fine. I've got plans this weekend also, ironically also a family party. The pressure are kind of a 'feel' thing. I try to set the low side in the 33-38 psi range but I also watch the center vent temp while I'm charging it.

[cali260Z]

LOOKS LIKE GREAT SUCCESS:cool: went by the mechanic shop today Mechanic Mike's automotive ASE cert. 825 Andreason dr. Escondido 760 739-8147

Give him a call, good guy!

checked out my system, and got rid of the R12 and did the suck down on her every thing looked good for a 35 year old system. i got her home i hooked it to the ester oil and added 1 can of freeze 12 (12 oz.) ( i have 2) popped the meat thermometer in the vent and ive 40deg. consistant @ the vent. Now i have NOT p/u the gauge set at harbor freight yet. and i dont want to OVER charge the system and blow a hose.

should I add the other can or just hold off and let it ride??