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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...

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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.

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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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