R134 A/C conversion

[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.

[WVZR-1]

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.

Drops in the evaporator tube.

[LantanaTX]

Drops in the evaporator tube.

Great thank you!

[WVZR-1]

Great thank you!

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-Evaporator-Chevrolet-C4-Corvette-1990-91-92-93-/251269265979?pt=Motors_Car_Truck_Parts_Accessories&hash=item3a80d0ba3b&vxp=mtr

[Schrade]

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.

[LantanaTX]

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.

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.

[LantanaTX]

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-Evaporator-Chevrolet-C4-Corvette-1990-91-92-93-/251269265979?pt=Motors_Car_Truck_Parts_Accessories&hash=item3a80d0ba3b&vxp=mtr

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

[scottfab]

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]

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]

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

[scottfab]

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.

[Kevin]

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