R134 A/C conversion
 

Does anyone know where the orifice is? I realize I can just put the R134 in but changing the orifice to a variable results in colder air. Usually there is some dimpling in one of the pipes near a union which holds the orifice but I am not finding it on this car.

Re: R134 A/C conversion
 

Drops in the evaporator tube.

Re: R134 A/C conversion
 

Great thank you!

Re: R134 A/C conversion
 

You should see the crimp in the tube. Those connections can be difficult to unthread.

The crimp can be seen here:

http://www.ebay.com/itm/AC-Evaporato...d0ba3b&vxp=mtr

Re: R134 A/C conversion
 

I converted an '87 to 134 without changing any hardware, except an adapter fitting, that I remember.

I did do the conversion flush a couple extra times, and vented it ( just to see how much was left, of course ;) ), and had no problems thereafter.

Re: R134 A/C conversion
 

I did the same the first time I converted one, but it never got quite as cold and then I learned about changing the orifice and then freezing cold.

Re: R134 A/C conversion
 

Thank you, I must have missed it. Just couldn't see the crimp. They are usually at the evaporator or the filter dryer.

Re: R134 A/C conversion
 

chances are you're going to introduce some moisture to the system when you put the new orifice in I would suggest changing the dryer while you're in there. they are surprisingly cheap

Re: R134 A/C conversion
 

Never had to replace a dryer before when doing this, but the system must be evacuated before charging.

Re: R134 A/C conversion
 

Its always recommended to change out the receiver driver before doing the conversion. Your going to have to recharge the system anyway.

Re: R134 A/C conversion
 

Actually you can even forgo the evacuation (coming from multiple experts, shops and my own experience) if the system has not been left open long, especially if a new dryer is installed. It takes out moisture.
It's like turning the rotors for a good brake job.
You don't have to, and you may get away without doing it a time or two
but a good brake job says, yah, ya need to.

PS all this applies if you simply adding R134a to an existing R134a system. If you're converting from R12, oh boy. A completely different animal. Been there done that.

Re: R134 A/C conversion
 

just converted mine last year...of course my compressor locked up so....