the R12 system will get just as cold as the same system with 134s...I have done may of them...my personal system I used as a test bed was r12 and I converted it...32degrees out the vents with 134a...the type doesnt make as much a difference as the operating pressure...

for r12 and 134a i fill them the same...just until the compressor stops cycling at 2000 rpm and I try to do it at 70f or close to that....

kinda hard to type as currently the PC is hooked to the big screen

 

My truck used to be R12 system and i chaged over to 134a no problem , the only thing i change was the reciver dryer and I install the quick connector adaptors. It gets really cold during summer time . I have heard lot of people say that with R12 system if u change over to 134a you only get about 90% cold, because the condenser .They say that 134a need more space to tranasfer heat and condensor its bigger that R12 system and you might loose some preasure because 134a will leak trhoug the R12 hoses. I havent had any problems. for me it work ok.

 

thats all a MYTH...when the conversion took place long ago they used to say that the new freon ate the o-rings....thats a myth too

 

Every R12 system I have converted to 134a doesn't stay cold when sitting still. This is Florida. I don't want that happening to me anymore. I want a/c that blows ice cubes.

 

thats because the compressor is worn out...134a ones do that too...

that and/or the condensor is dirty...if it isnt clean it cannot transfer heat...or there isnt enough airflow over it when sitting still...

mine used to go up to 45degrees sitting still..now with the dual 12s ont he condenser it stays 38-40....

I tested it good today as it got up close to 90degrees...32 degrees out the vents within 5 minutes in a 120degree cab...didnt take long at all to cool it down to 50degrees

 

I remember that , they said you need to replace hoses, condenser, dryer ect. They just want to make money. System work the same with R12 or 134a.

 

dr_bowtie its right . The main thing for any A/C system to work its to have a good A/C compressor and enough air flow on condenser for good heat transffer. I live California central valley, summer gets up to 110 and my old compressor still getting to about 40 degrees . My A/C compressor its old , I got my truck in 1995 and I havent replace it .

 

While I appreciate your faith in the R12 system, you can't sell me on it with 134a inside it. I've done countless conversions all with the same result, they blow warmer sitting still. I've done it after putting on brand new compressors, I've changed most of the system, and yes I do check the condensers too. What works in Indiana doesn't necessarily work here. I think you would choke on the sweaty hot humid air here. All my Jersey relatives do.

 

Rather than start a whole new topic, I'm going to ask the question here at the risk of being yelled at.

My new-to-me '95 F150, Str. 6 with 5spd. manual is having an A/C issue. When I turn the A/C on, and the compressor comes on, I can feel a "drag" on the power, hear a hum in the cab, and feel a vibration through the wheel and floor. When the compressor shuts down (cycles) it all goes away. I am therefore conviced that my compressor has bad bearings and is dying.

Knowing as much about air conditioners as most of you know about PHP programming and SQL, I was hoping for some help.

Can I just replace the clutch/bearings, or do I need to replace the whole compressor? If so, do I need to drain/evac/recharge the system?

Thanks!

 

take the belt off and spin it and see if its the clutch bearings or the pump bearings...you'll know....