how much r134a for a complete fill

[RonPorter]

As I understand, the R134a SHOs have bigger condensers that can be retrofit to the older R12 SHOs. Supposedly this is the only difference between the two systems. Per James, IIRC.

 

[SHOtimer]

As I understand, the R134a SHOs have bigger condensers that can be retrofit to the older R12 SHOs. Supposedly this is the only difference between the two systems. Per James, IIRC.

Everything i've always found has the same condensers whether R12 or R134a.

Doug

 

[zak]

Given the almost impossibility of getting R12 in NYC, I've thought about trying one of the HC refrigerants, since the R134 (a) cools like poo, and (b) saps no less than 219HP from the SHO V6 when the compressor is running.

The conversions never work well. I just did a Criagslist search for NYC and found two different sources of R12 at $15/can. If that doesn't work for you drop me a PM. Make sure the cans aren't rusty.

To the original poster - it can sometimes be difficult when using charget cans to get all the refrigerant in there. Some tricks are:

1.) after the can has mostly discharged, place it into a warm water bath (wear safety glasses!).

2.) Mist the condenser (in front of the radiator) with water from a hose.

On edit, I hear you about the R134a systems sapping too much power. The head pressures on R134a are much higher than R12.

 

[jc2001s]

I have several 25+ year old cans of it left over from when it was 75 cents a can.

Lucky its over 275/keg (30#'s) right now. I actually had used r404 in my old car since it had an enlarged condenser anyways.

The conversions never work well. I just did a Criagslist search for NYC and found two different sources of R12 at $15/can. If that doesn't work for you drop me a PM. Make sure the cans aren't rusty.

To the original poster - it can sometimes be difficult when using charget cans to get all the refrigerant in there. Some tricks are:

1.) after the can has mostly discharged, place it into a warm water bath (wear safety glasses!).

2.) Mist the condenser (in front of the radiator) with water from a hose.

On edit, I hear you about the R134a systems sapping too much power. The head pressures on R134a are much higher than R12.

I have seen many MANY conversions work flawless for years. And as far as head pressure, at 6lbs in a system (olders semi trucks) changing strait up (no conversions) from r12 to r134a there is an increase of head pressure of 8 lbs with just the cab being cooled, and less when the bunk is also being cooled.

 

[ItsAnAdventure]

I remember reading at one time that a '95 (post factory change-over) condensor was needed to get better cooling temps on a R12 to R134 converted system.

 

[Airborne]

2lbs of R12 if I recall, but more importantly where the **** are you getting R12 from? That's shit's been unobtanium for over a decade.

just a note, there is a decal on your radiator support that say how much it takes

I read the decal and it says 2 lbs 8 oz of r12. '89 has the same ac parts as the '91, so I will put in 2 1/2 lbs of r12 and tell you how it goes.