i have a 91 r/s 3.1 and i cant seem to find the leak in my a/c ., i have changed over to 134a last year and have had problems keeping it fully charged ,.once every two months im adding another can,.or the compresser wont come on! so im wandering if any one has a diagram showing me system lines and such so i can use it as a chert on where to start looking.,
thanks in advance

 

The problem is in the new-type Freon. It is a much-smaller molecule, that easily leaks out of an older system. Furthermore, it just plain sucks.
Also, when you lose enough freon, a safety switch shuts the compressor.

I have recommended Envirosafe before. It is an organic refrigerant available on the 'net. Not only affordable, but genuinely is as efficient as R-12. Nay-sayers say that it is flammable and dangerous. I say that it is wonderful, and gasoline is also under the hood, and even more flammable. Besides, the stuff is scented in case you do have a leak. Because Envirosafe is a big molecule, it leaks very slowly. Caution: Only works with mineral oil or ester oil- not with the PAG oil that most R-134 installation kits contain.

Seth

 

ok i see a lil diff now about the size of the molecules, i have never heard of the stuff you talking about though, also how would i install mineral oil? it would seem as if i would need to pressurize any oil like that to inject into the system? im not relly concidering this but .does sound intresting

 

Your R-12 based system came from the factory with mineral oil lubricant circulating within the system. It is pumped along with freon, throughout the A.C. plumbing. It is stored within that receiver/dryer canister, but also coats all pipes and is there exclusively to oil the compressor.

R-12 and Envirosafe are compatible with mineral oil or ester oil. R-134A is compatible with only ester oil or the more common PAG oil. Once PAG oil is introduced into the system, such as when installing a R-134A kit, you cannot go back to R-12 or Envirosafe, w/o flushing the entire system and replacing the receiver/dryer which stores most of the oil.

R-134A sucks big-time, and is very rough on the compressor. You live in a hot place, so R-134A as a drop-in replacement for R-12, is dumb. For R-134A to work, you need to upgrade hoses, compressor, and condenser [the thing in front of the radiator]. Envirosafe or some hard-to-get R-12 is still easiest and coldest.

BTW: to get any of these oils into the system, you do it before the plumbing is screwed together.

Seth

 

when i converted to r134,
i had the same problem leaking.

it was leaking from the feeding line(the low pressure port cap)
u take the top cap and the top part of the valve? off,
then the leak stopped.

u only need that thing on when u feed or recharge.. and it leaks with it ON,
and no leak without them.

if leak still continues,
try using red colored refrigiant on the next recharge,
u'll be able to spot where the leak is, look for red spot.

compressor wont come on if the refrigiant's low,
but also beware the compressor enable switch(not sure of the exact name)
is another often failure item.

its like 20bux in NAPA and u can replace them without the need of flushing,
replace that if u have compressor not engaging(while the system is full)

 

How many cans of the envirosafe did you use, and what is your low side pressure for best efficiency? I used Envirosafe, and get very good cooling, unless my car has been in the sun, then it takes forever to cool off. I think my low side pressure is a little high.. about 45 PSI Idling at 80 degrees. I used all three cans.