What happens if you overcharge the orifice tube?

What happens if you overcharge the orifice tube?

Overcharging by as little as 2-oz can dramatically reduce the performance of your car’s AC system. MORE is NOT better! Most orifice tubes fail due to contamination in the AC system due to sealer, oil degradation or mechanical deterioration.

What causes an orifice tube to fail in an AC system?

Most orifice tubes fail due to contamination in the AC system due to sealer, oil degradation or mechanical deterioration. Replacing a plugged orifice tube without solving the root problem will result in another plugged orifice tube.

Where is the suction throttling valve on a 134a GM?

Ignore the sight-glass. A properly charged 134a system will likely show bubbles in the sight-glass. Typical 134a charge rate will be approximately 70-80% of the factory R12 charge amount. The suction throttling valve is installed on the evaporator, near the firewall.

Can a GM R-12 be converted to 134A?

Contrary to popular belief, most cars originally equipped with R-12 can be converted to 134a and still keep you just as cool. Understanding the basic type of a/c systems GM used on their classics will help with you determine the best route for your project. This is a generic term for the earlier valve regulated systems for the early GM vehicles.

Where is the orifice tube on my GMC?

The orifice tube is “in-line”. Not sure on 2007, but on my 2002, passenger fender where line breaks apart. (2 lines connected together with “nuts”). You can usually spot where the orifice is by looking for the slightly enlarged diameter of the line near the connection of the 2 lines.

How do you remove the orifice tube in an evaporator?

Remove the orifice tube using needle nose pliers or removal tool. Note the orientation of the orifice tube. It must go back in the same way. Lubricate the O-rings on the new orifice tube with AC oil. Insert the new orifice tube into the evaporator or LLOT or SLOT.

Where to look for an orfice tube change?

You can usually spot where the orifice is by looking for the slightly enlarged diameter of the line near the connection of the 2 lines. You’re probably fine on oil. Most of it stays in compressor and lower points in the system.

Where is the accumulator and orifice tube located?

I had an A/C leak in my 2007 classic Silverado 2500HD Dmax. I used dye and found that it is leaking where the pressure sensor connects to the Accumulator or filter/drier. I am going to replace the Accumulator and the Orifice tube. I have 4 questions. 1. Where is the Orifice tube located.