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R134 Orfice Tube

jcminick on Fri August 08, 2008 10:25 AM User is offline

Year: 1993
Make: Chevy
Model: S10 Blazer
Engine Size: 4.3L
Refrigerant Type: R134
Country of Origin: United States

When converting from the original R12 to R134, do I need a different orfice tube than the stock one? I've read about an automatic adjusting orfice tube for "severe climates" (105+ degrees), will this work beter for R134?

TRB on Fri August 08, 2008 12:13 PM User is offlineView users profile

Personally not a fan of the VOV valves.

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iceman2555 on Fri August 08, 2008 3:31 PM User is offlineView users profile

In all the retro we have completed....never used anything other than the OE spec'd orifice tube. If the retro is completed properly...the system prepared properly.....charged properly and the engine cooling system working properly...the system should cool properly.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

jcminick on Fri August 08, 2008 3:43 PM User is offline

What is the significance in the different colors of orifice tubes for GM? I think the one I am currently using in my Blazer is white. Since my Blazer started life as an R12 system, should I use a different color for R134A? THANKS!!!

chris142 on Fri August 08, 2008 8:59 PM User is offline

I always put a yellow tube in a GM when I retrofit one over to R134a. Stay away from the Smart tubes. They are nothing but trouble.

iceman2555 on Sat August 09, 2008 11:55 AM User is offlineView users profile

Your vehicle has the orifice tube located in the evap inlet...there are two orifices for your vehicle....the white/neutral (std GM) is .072....the yellow/white is .062...GM also offers a orange/white with tabs.....057. Hopefully this is the answer to the question presented.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

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