AC Help

I recenlty replaced my condensor and recharged my already converted R134 system...everything went well.

Yesterday I helped a buddy of mine with his system on a 91 gt. He bought the car about 4 years ago with a non functioning R12 system. Slowly over the past several years he has been replacing parts. He has replaced the evaporator, the dryer and the compressor. He did not replace the oriface tube or condensor.

We pulled the vacuum and charged the system....no leaks. The problem is that the air out of the vents gets no colder than 60 degrees. He talked to a mechanic friend of his who told him the R134 needs a specific oriface tube and that the R12 one is not in spec and is most likely the cause of the poor cooling.

I have looked at all my favorite mustang suppliers and cannot find one that says it is for a specific system. The ones on the Autozone website say they are compatable with both style refridgerants, which would mean that the mechanic friend is wrong???

Does anyone know if the oriface valve is specific to R134? If not, what would your guess be as to the source of the poor cooling?

Just a note: We checked the blender door and it appears that it is fully shutting.

Thanks for any help!

I may be referring to some of the items by the wrong name...We did replace the accumulator (dryer as I called it). We used 8 oz of the PAG oil for R134 systems.

I forgot to mention that the pressures were all on the high side of their limits. The low side was somewhere around 60 and the high side around 370ish. This was inside a 100 degree garage (per thermometer on wall), about 94 outside, but running car made it much hotter. At the time I thought the presssures were high because of the excessive heat. The high temps made the car run a little warm in the garage, but all temps taken from the ac vents were done on the highway at highway speeds with car running at operating temps.

By the way, we used almost three 12oz cans...hard to tell how much was left in the last can. I would guess less than half. So we are probably somewhere about 30oz or so in the system.

How can we go about lowering the pressures? Does anyone think this is the culprit?

Thanks for all replies!