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What orifice tube should I go with

s10project90 on Sun August 15, 2010 2:03 AM User is offline

Year: 1990
Make: Chevrolet
Model: S10
Engine Size: 4.3
Refrigerant Type: R134A
Ambient Temp: 95
Country of Origin: United States

I have a 1990 S10 and I am not happy with the performance of the A/C. When it is 95 degrees outside, the best it will do is 45* while moving and 60 at red lights. I already swapped the white orifice out for a blue one, and while it helped somewhat, it is still not good enough. It is running on R134A right now. Should I try one of those alternative refrigerants like Envirosafe or Duracool while keeping the blue tube? Every 93 and earlier S10 I have ridden in that was converted to R134A sucks just like mine. Anyone got any ideas?

GM Tech on Sun August 15, 2010 7:51 AM User is offline

Those "boxy" style truckd were known to be rotten even when on R-12...Be glad you don't have a 4 door blazer-(same system) people in the back seat always wanted out when it was hot outside. Problem is the condenser and evap are just too little.......good luck trying to redesign OEM...

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Dave in Texas on Sun August 15, 2010 8:38 AM User is offlineView users profile

The alternatives are no better. R12 is still available. Look on your local area CL.

At 2, I went home with a 10. At 10 I woke up with a 2 !!

SeppW on Sun August 15, 2010 12:41 PM User is offline

I have a '94 S-10 4-door Blazer that was converted to R134a several years ago. The shop flushed it out, replaced the R4 with a new Delco unit, receiver/dryer, and OT (same type used on R12). They left GM tube and fin condenser installed. I have to say I'm happy with it. It cools very, very well, despite the high humidity that is common around here. Not sure about back seat area, but I don't have people back there a great lot either.

Have you check for proper charge? Leaks?

Edited: Sun August 15, 2010 at 12:53 PM by SeppW

TRB on Sun August 15, 2010 6:36 PM User is offlineView users profile

What are you pressure readings at idle. How much R134a did you add?


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