91 q changing a/c to 134a

[Fridge]

I kept playing with different refrigerants on my q being to lazy to pull the compressor and change the oil. I had settled on a mixture of m66 416a and 22. worked great till the high discharge pressure blew the seals out and dumped the oil charge.

So I found a new in the box comp on ebay. I will change the oil and dryer and do a r-11 flush on the system. Then recharge with 134a. Will the condensor handle 134? I saw a new one for a 95 on Ebay Would that one be better or would it even fit?

Also I still have 3 cans of r-12......any offers?

[Q45tech]

The R12 condenser will only be 85% efficient with R134a, the cause of much unhappiness with conversions. R134a condensers are of a different type but you cannot use with out replacing piping and dryer and sensors.

The sensor switches and dryer media [breakdown internally] will be the wrong pressure for R134a.

[ScottJackson]

Propane. Very close to R22. Not as dangerous as some people would want you to believe. Works with mineral oil, which also helps your compressor live a long happy life.

[Fridge]

I had a van that was charged with propane. Worked ok but had very high discharge pressure like around 400 psi

I guess I will have to live with the 134a since it is cheap and the r-12 price is insane. Now when you say the dryer is incompatable does this mean it breaks down with the poe oil? I will post my results when I get it done.

[maxnix]

Propane. Very close to R22. Not as dangerous as some people would want you to believe.

Not if you dont' regard flammabel gas under pressure as a problem.

Today's word is BOOM! followed by FIRE!

[ScottJackson]

Oh yeah, it's still not entirely safe. I'd probably go R134a instead of propane too, but if I didn't want R134a, it's prob what I'd use. If you get into an accident that ruptures the line enough to release a large amount of concentrated propane into an area that also has a substantial spark or fire, it could add to it. Although at that point I think I'd not be so concerned about that. As for the high side pressure, I dunno why it would be 400+psi unless maybe the system was charged with the same weight of propane as is called for with R134a. If I am remembering correctly, it should take just a little over half the R134a charge in an equivalent size system.

[Fridge]

Well I chickened out. I found some cans of r-12 on ebay. I will go ahead and recharge it with 12 and hope I dont get any leak$