“If the orifice tube breaks in the core, it must be extracted using tool T-83L-1990-B. Thread the end of the tool into the brass tube end of the orifice tube. Pull the orifice tube from the core. If only the brass tube comes out, thread the tool back into the orifice body and pull that out.”

It also prevents any remaining liquid refrigerant from returning to the compressor. The accumulator has a desiccant to consume moisture. It is located on the “suction” or “low-pressure side” of the AC system, between the evaporator and the compressor.

Symptoms of a Bad or Failing Expansion Valve (Orifice Tube)

• AC system performing worse than usual and blowing warm air. One of the first symptoms of a problem with the AC expansion valve or orifice tube is an underperforming AC system.
• Frost on AC evaporator or coming from the vents.
• AC compressor constantly running.

It should be in the low pressure line ( bigger line ) at the connecting point, near the condenser, and line going to the dryer. You will have to open the line and look inside to see it.

The orifice/filter is usually installed in the metal part of the high press line where the hex nut joins the long part of the metal portion of the hose.

the orfice tube is locate in the line between condenser and evaporator. near the spring lock coupling. you must unbolt the cruise servo and overflow bottle, reposition them out of way and you will see the line connection..the orfice is inside line near that uniion.

It always has to be orange to correspond with the truck’s orifice diameter.

Expansion valves are an active device, they regulate the flow of refrigerant to the evaporator depending on evaporator temperature. An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback.

Faulty orifice tubes can also result in too little refrigerant flow through the evaporator. If this is the case, the flow of refrigerant will not be enough to absorb the heat that is coming from the condenser. When this occurs, the A/C simply will not be performing well enough to allow the system to cool.

A fixed orifice tube contains a small brass tube encased in a plastic case with a filter at each end to protect it from any debris in the system. It’s located on the high side between the condenser and the evaporator core.

Two different pressures exist in the cycle – the evaporating or low pressure in the “low side,” and the condensing, or high pressure, in the “high side.” These pressure areas are separated by two dividing points: one is the metering device where the refrigerant flow is controlled, and the other is at the compressor.

HVAC metering devices operate by separating the high and low side pressures of air conditioning or refrigeration systems by adding restrictions to them. When the refrigerant enters the metering device, it is in the form of high pressure, high temperature and subcooled liquid.

HEAD PRESSURE – Pressure of refrigerant from discharge reed valve through lines and condenser to expansion valve orifice. HIGH SIDE – Same as head pressure; side of system which includes vapor into condenser and liquid to expansion valve. (Also see Low Side.)

The low side of a refrigeration system usually houses the evaporator, suction line, and any accessory components located within the suction line. Accessory components can include evaporator pressure regulator valves, suction filters and driers, crankcase pressure regulator valves, and suction accumulators.

The refrigeration cycle contains four major components: the compressor, condenser, expansion device, and evaporator. Refrigerant remains piped between these four components and is contained in the refrigerant loop.