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Step 2: Locate the orifice tube in your vehicle. You can refer to the service manual for your vehicle for the exact location of the orifice tube. In most models, the tube is located in a Y-shaped junction between the condenser and the front evaporator. Some vehicles may also have the tube placed on the side of the radiator near the mounting. An expansion valve is an AC component that is commonly found on many road going vehicles. It is usually installed at the evaporator inlet and works together with the orifice tube to regulate the flow of refrigerant through the vehicle’s AC system.

location of orifice tube on 99 chevy suburban

GEB on Mon April 24, 2006 3:34 PM

Year: 1999
Make: chevy
Model: suburban
Engine Size: 5.7l
Refrigerant Type: 134

I'm having trouble locating the orifice tube on this system/ dual air thanks

Chick on Mon April 24, 2006 3:47 PM

Dual air it should be right before the split to the rear line, or just after it towards the evaporator (High side) hope this helps.
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Chick
Email: Chick
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Freedoms just another word for nothing left to lose
Edited: Mon April 24, 2006 at 3:48 PM by Chick

chris142 on Wed May 17, 2006 9:33 PM

If I remember correctly it's in the connection under the air filter. Easiest to get to after removing the air filter assembly.

mickeycool17 on Sun July 16, 2006 9:30 PM

just got done working on a 99 chevy suburban. the orifice tube is in thr high side line of the front evaperator,it the lower line as you face the firewall. take off the window washer jug. the small line. but be very careful trying to undo thr fitting its tight.use 2 wrenches. dont slip cause if you do you coukd wipe out the evaporator lines and the heater core lines right below! that would be a pisser we gave up cause once we broke the connection loose it became very hard to turn the fitting. any suggestions?
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geturdone

Chick on Sun July 16, 2006 9:53 PM

When you reassemble it, a 'drop' of nylog on the threads will help it go back on easy...Not just for O rings...
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Chick
Email: Chick
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Freedoms just another word for nothing left to lose

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Auto Ac Orifice Tube Location Fuse

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Ac Orifice Tube Purpose

Clogged orifice tube

Max-Lumina on Sat July 16, 2005 6:52 PM

Year: 1993
Make: Chevy
Model: Lumina
Engine Size: 3.1
Refrigerant Type: R134

Auto Ac Orifice Tube Location

93 Chevy Lumina 3.1 , R134 - Original Symptons = Load Clanking Knocking Noise from compressor , no cold air , clutch engages , high pressure readings on the low side ...
In replacing the orifice tube , found the old one very clogged ...
Will replacing the orifice tube correct the compressor problem,
or should I plan on replacing the compressor while I have the system discharged ?
Will also be replacing the accumulator / dryer ?
Many thanks to the contributors of this forum ...

tony1963 on Sat July 16, 2005 7:27 PM

My suggestion is to flush the whole system, replace the compressor, drier, orifice tube and pressure switch.
I just did a Cadillac for a customer. It needed a retrofit. The orifice tube was really dirty. I recommended a new compressor but they said, 'just make it blow cold air'. Again, I recommended a compressor.
Oh well. We did the service. Made cold air for about two hours. Then, the fuse for the AC blew. It blows almost instantly.
Bad compressor/clutch.
Should have done the whole job right.
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Grove Automotive Group, Inc.
An Alabama Corporation

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