R-444A VS R-1234YF refrigerant

[SC Maintenance]

Discussions above well taken. So the R444a is compatible with systems for R1234yf. Can R444a be used to merely top off a system that still has R1234yf in it? Or, would one have to completely evacuate the R1234yf first before recharging with R444a?

Since no one has opined (see the thread on why people opine on crap they don't know about. ).

What I know at a very high level is mixing different refrigerants is generally a bad idea because they condense at different pressures and temperatures. Physics 101 sort of answer I know.

Since R444a is more efficient that R1234Y, I suspect that would also be the case here. That would be my working theory which could be very wrong.

 

[zzyzzx]

This 444a stuff seems to be hard to buy. Not sure why anyone would use it when R134a is cheap and easy to find.

 

[SC Maintenance]

This 444a stuff seems to be hard to buy. Not sure why anyone would use it when R134a is cheap and easy to find.

R-444A is a option for R1234YF, not R134 as far as I know? There are other options for R134 though I think?

R134 is no longer allowed in new cars. R1234YF is mandated.

 

[zzyzzx]

R-444A is a option for R1234YF, not R134 as far as I know?

Supposedly plenty of people are using r134a in r1234YF systems, although instructions have been censored off the internet.

 

[CarLuver]

Supposedly plenty of people are using r134a in r1234YF systems, although instructions have been censored off the internet.

if you look at the pressure charts they are almost identical . i think the price drop of 1234yf may have to do to when the price was high , due to the high price , folks experimented and found out 134 works in the system. So a lot of diy folks did it and demand goes down