Can PAG and mineral coexist in old R12 system?

[Swedal]

I'm going to replace a condenser and drier on a Mazda MX6 1993 with R12 system. There is a sticker in german that system contains ozone harmful gas but on the other hand there is a R134 connector on the high side so I really don't know whats in the system and whats done with it. I have tired the system with a HC mix of 50% R290 propane and 50% R600a isobutane (sells as Hychill in austalia) and that works with both PAG and mineral. System cools well but I had to use more R600a because of high head pressure. After replacent of condenser and drier I will use 50/50 mix again and get some better performance.

Now to the question. I will need to add some oil. Can I use PAG46? I know the HC mix will work with both types of oil but what if there still is mineral oil in the system? Customer budget is very limited so I will not mess with a flush and oil change. Will PAG and mineral oil work together with HC?

[cadwaladr]

No in my opinion

[Greek_engineer]

You are taking serious risks...

[RANGER1]

Why would you not just change oil?

[charlie patt]

Stop taking the mickey by posting stupid posts I'm really glad u are in a different country you do realise with the correct situation u could kill someone and you are worried about the oil

[RANGER1]

Stop taking the mickey by posting stupid posts I'm really glad u are in a different country you do realise with the correct situation u could kill someone and you are worried about the oil

Who are you referring to?

[RANGER1]

I’m suggesting change oil to use 134a, not a **** head suggesting propane or other flammable refrigerant.

[cadwaladr]

Its a wind up the guys not got a clue playying with fire and dies not understand the basics walk away from the job if it is a job?

[charlie patt]

Swedal mixing hydrocarbons in standard car circuits

[Swedal]

I'm sorry if I made a controversial question. In Europe you can not buy R134a as a consumer but you can buy a can of R290/R600a mix to refill your AC. Same in Australia. Look at Hychill, they sell HC replacements for all kinds of applications. Did not know that this was big no no in the states. We on the other hand are not allowed to buy an AR15 at the super market :)

[cadwaladr]

So make the repairs and get sonenody to charge it with 134a change the oil etc game over

[RANGER1]

I'm sorry if I made a controversial question. In Europe you can not buy R134a as a consumer but you can buy a can of R290/R600a mix to refill your AC. Same in Australia. Look at Hychill, they sell HC replacements for all kinds of applications. Did not know that this was big no no in the states. We on the other hand are not allowed to buy an AR15 at the super market :)

Swedal,
It is contraversial because
1/ the equipment was no designed for a flammable refigerant
2/ it could injure yourself &/or others
3/ booby trap for next person working on it if they do not know
4/ just because you can, does not mean you should.
5/ who is liable if there is an accident of some nature with it.

Others can add more other points.

[chemi-cool]

I ever liked this thread.

Experiments of this kind can some how be ok but on the other hand can easy kill a person.

Always, always, always folow manufacturer instuctions and if you want to change some basic components, get a permition from them.

[charlie patt]

The reason this post drove me nuts is the fact a few years back some so called engineers filled a mf tractor with 290 refrigerant now these particular tractors always suffer from leaking evaps
the following day the driver lite up his cigar must of been a posh farmer anyway the next thing he new he was in casualty the only reason I new about this is I had to go and do a report as a third party we had no involvement with this until the insurance firm got involved the long and short of it you aint playing with a2l gas this ain't no domestic either it holds a bit more than a domestic please remember to look after the guy that may be working on it later on after you

[Swedal]

All new cars is using A2L gas nowadays. R1234yf is A2L and burns quite good. Do they have any special safety features or is it just a sticker and different service ports that warns the next guy about it?

[Shibhrac]

IF the car was manufactured in 1993 i assume the refrigerant is 134 a.