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orifice tube

trucks on Mon June 23, 2008 8:12 PM User is offline

Year: 98
Make: chevy
Model: silverado
Engine Size: 5.7
Refrigerant Type: 134a
Ambient Temp: 70
Pressure Low: 80-110
Pressure High: 90-100
Country of Origin: United States

Just changed comp. & accumulator. System blowed cold, but next day was cool. Checked the psi. again, Low side was high and the high side was low. I think it may be the orifice tube but I am unable to find it. Please help ?????????????????

mk378 on Mon June 23, 2008 8:28 PM User is offline

If it's a variable compressor (model V5 or V7), control valve could be acting up.

bigkev on Mon June 23, 2008 8:29 PM User is offline

Its in the bottom hose right off of the condenser usually, you can see dimples in the line, If its not there sometimes it can be further up the line inside the liquid line between the condenser and the evaporator. usually you can get to it pretty easy if you take the condenser loose at the bottom hose. Just be carefully because that bastard fitting always strips.

chris142 on Mon June 23, 2008 9:28 PM User is offline

Tube is behind pass side front blinker lens. It's in the lower tube coming out of the condenser that is at a 45* angle.

GM Tech on Mon June 23, 2008 10:28 PM User is offline

When you check that OT look for schrappnel- stainless steel pieces-- your pressures indicate a reed failure in your compressor-- does the compressor turn very easily- with one finger?? does it have little "catches" as you rotate it? if so- time for a new pump- and a good cleanout of the system.......

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......

Edited: Mon June 23, 2008 at 10:29 PM by GM Tech

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