Adding R-12 to a R-134A system Question?

[lzenglish]

Crazy Question: I have a 1995 honda that uses R-134A refrigerant. I have been retired from the HVAC buisness for 6 years now, and have no 134 left. I went to the auto parts store today, and found an 18 ounce can of 134 is about the same price as crack cocain (I Guess)! So, since I do still have 25 pounds of 12 sitting in the barn with the jug rusting away, can I recover the remaining 134, replace the shaft seal in the compressor, pull a vacum, and recharge with the 12? Or,do I need to repace the oil with a mineral base type? And, will the TXV still give me a satisfactory operating temperature range? I guess the bottom line is has anyone ever done this, and had success with it.

Wayne

[charlie patt]

134 runs on ester 12 is mineral you can run your twelve in a r134a system because ester runs with twelve no problem provideing 12 is still legal where you are i would leave shaft seal just vac well 12 is a slightly better performing refigerant than 134 pity its banned here thats what i say

[monkey spanners]

Most cars run PAG oil with R134a. Don't know how it will mix with R12.

Why not just put the right refrigerant in it?
It can't be that expensive!

[charlie patt]

the honda takes 185 cc of poly ester when new on 134a

[Brian_UK]

Assuming that you are in the USA then you should know that you can't officially put R12 into a system nowadays. Policing that will be a whole different ball game though.

[monkey spanners]

the honda takes 185 cc of poly ester when new on 134a

Aha! Live and learn. Have you got a book with this info in? Or a link?

When i did my car aircon course we were taugh that R12 used 5GS and R134a used poly alkylene glycol oil. No mention of polyol ester oil in automotive aplications.
I'll have a look for my notes.

Jon

Just found this, would be worth a read Wayne.

http://www.autofrost.com/hotshot/index.html

[charlie patt]

we use the autodata ac books there are 4 in all from 1987 to 2010 they are on cd but i only have the books as my van computer is full of mhi and daikin bits if you ever need any info its not aproblem be lucky

[charlie patt]

sorry ms honda used ester up to 1997 on there change from old to new ref on factory fit but from 1998 on most in uk ie civic where dealer fit thats when pag took over they did chop and change but i agree fill it with what should be in it r134a

[monkey spanners]

sorry ms honda used ester up to 1997 on there change from old to new ref on factory fit but from 1998 on most in uk ie civic where dealer fit thats when pag took over they did chop and change but i agree fill it with what should be in it r134a

Nothing is simple in our trade now is it

I've only had to change oil in two vehicle air con systems, one was and R12 combine harvester and the other R134a fork lift truck. If i have to again i'll make a point of checking the data plate on the compressor!

Jon

[sibahut]

??????????? I am really confuse, is it possible diffrent type refrigrent to add to another?

[charlie patt]

no never mix refrigerant but with the above pull one out and put another in but if poss always use the original

[wambat]

Ester oils are generally compatible with existing mineral oils, and system components. So reclaim the 134 pull a good vacuum and rechrge with r12

[sedgy]

hi wombat . can I ask the question is R12 still sold in your ****ry? and is that the us a?