R134 A/C conversion - ZR-1 Net Registry Forums

scottfab · 04-28-2014

Quote:

Originally Posted by LantanaTX

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.

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

LantanaTX · 04-28-2014

Quote:

Originally Posted by scottfab

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

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

GOLDCYLON · 04-28-2014

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

scottfab · 04-28-2014

Quote:

Originally Posted by LantanaTX

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

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.

04-28-2014	#3
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