Questions and Answers
Chevy Tahoe Expansion Block/Orifice Tube Locations
Q. I have a 1996 Chevy Tahoe, 2 door with a 5.7 liter V-8. My A/C stopped working and I was told I needed a new compressor, accumulator and orifice tube. I replaced the accumulator and compressor but I do not know what an orifice tube is or where it is located or how to replace it? Can you help me?
Why did it need a compressor? Did it seize up? If so, there may be shrapnel scattered all through the A/C system. This would require a flushing of the system. The orifice tube is in one of the lines. Most likely one near the accumulator. Look for a couple of little "dings" in the aluminum tubing.
With Front A/C Only
The Expansion Block/Orifice Tube is located in the condenser outlet pipe (high side line) at the liquid line connection.
With Front and Rear A/C
The Expansion Block/Orifice Tube is located in a Y-shaped junction block in the tube between the condenser and the front evaporator. The junction block is located near the right side of the radiator support. The expansion tube is located between the junction block and the front evaporator.
The orifice tube is a restriction that lets the system have high pressure on one side of it and low pressure on the other. It also has a screen on it to act as a filter to catch any metal particles but it doesn't catch them all. Sometimes they can be stuck in there and need a little heat to soften the O-ring that seals it to the inside of the line. Just make sure there is no metal in the lines or it will go through your new compressor and damage it.