Mechanics

CHEVY ORIFICE TUBE

1998 Chevrolet Prizm

Air Conditioning problem
1998 Chevy Prizm 4 cyl Front Wheel Drive Automatic 160000 miles

I have 380 high side and 35 low on a hot day and it doesn't change when I run the car and ac. Nothing gets cold. I am assuming I have a high side blockage. Does that sound right, and can you tell me where the orifice tube would be located?
Thanks!
Avatar
Homerbsharp
September 5, 2010.




Hi Homerbsharp, Welcome to 2carpros and TY for the donation

System Operating Pressure (3)
High Side270-305 psi (18.9-21.4 kg/cm2 )
Low Side34-40 psi (2.3-2.8 kg/cm2

I am assuming I have a high side blockage. if it is the high side will be low and so as the low side.

Could be air in the system or its overcharge

Removal Procedure

Disconnect the negative battery cable.
Discharge and recover the refrigerant.
Important: Cap the open fittings to prevent dirt and moisture from entering the refrigeration system.


http://www.2carpros.com/forum/automotive_pictures/12900_o1_4.gif



Disconnect the union (4) of the evaporator liquid hose (5) and the evaporator liquid tube (3).


http://www.2carpros.com/forum/automotive_pictures/12900_o2_5.gif



Carefully remove the orifice tube with needle nose pliers.
Installation Procedure

Important: Use new O-rings lubricated with 525 viscosity mineral oil.


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Install the orifice tube to the evaporator liquid hose.


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Connect the evaporator liquid hose (5) to the evaporator liquid tube (4).
Tighten
Tighten the evaporator liquid hose (5) to the evaporator liquid tube (3) union (4) to 25 N.m (19 lb ft) .

Connect the negative battery cable
Evacuate and recharge the refrigerant system
Operate the A/C system and check for leaks.
AD

Tiny
Rasmataz
Sep 6, 2010.
Thanks for " I am assuming I have a high side blockage. If it is the high side will be low and so as the low side. &Quot; I thought that when the engine was off the high side and low side would equalize, but there is no change. Am I wrong about the equalizing?

Tiny
Homerbsharp
Sep 6, 2010.
Try having it vacuumed out and see what happens

Tiny
Rasmataz
Sep 6, 2010.

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