A/C fundamentals question....

[VTKidder]

All A/C gurus....

What parts of an A/C system are changed when a system goes from R12 to R134a? I'm not talking a retrofit, or recharge, I'm talking ordering a new A/C system, and ordering it as a 134a system. You hear all the time "I retrofitted the system to 134a, but it just doesn't blow as cold as the R12 did." R12 and R134a are different refridgerants, and thus would have different cooling properties. New A/C systems blow ICE cold, because they have had all of their parts designed around using the properties of R134a. Adding R134a to an R12 system obviously doesn't work as well. So my question is....what parts of the A/C system are designed around the properties of a refridgerant, and are different than an R12 system? If you ordered a full R12 and a full R134a system, what parts would be the same, and what parts would be different? I take it the compressor is, probably the condenser, expansion valve and some others. What's your understanding of the difference? Thanks.....

-adam

[rage'nrat638]

order a sanden comp.for 134
they even make a different condensor for 134 that's supposed
to make it work better...
contact brothers and talk to them......
all tho have have bad luck ordering from them as of late

[VTKidder]

So I take it just the compressor, condenser and accumulator?

[Tx Firefighter]

The condensor is the main ingredient to a succesful 134 system. They need to be much more efficient than r-12 required.

Some vehicles have excellent r-12 condensors from the factory, and they convert to 134 real well. I've done lots of retrofits. Some work as good as r-12 others not.

They low pressure cycling switch is slightly different as well as the orifice on some systems.