Where is the orifice tube located in a car?
The orifice tube is typically found in the air conditioning system’s high‑pressure liquid line, between the condenser and the evaporator. In many cars it sits in a small metal section or within the receiver/drier assembly along that line, near the firewall or under the dash depending on the design.
How the expansion device fits into the A/C system
The orifice tube is one of the expansion devices used to meter refrigerant into the evaporator. Located in the high‑pressure liquid line, it creates the pressure drop that allows the refrigerant to flash into a low‑pressure, cold vapor as it enters the evaporator. Some vehicles use an orifice tube, while others use a thermostatic expansion valve (TXV); the location and accessibility of the orifice tube can vary by model.
Where you’ll typically find it on different designs
Below are common locations technicians check for the orifice tube in various car designs. The exact placement can vary by make and model, so always consult the vehicle’s service manual for precise location.
- In the high‑pressure liquid line running from the condenser toward the evaporator; this is the most common placement.
- Inside a compact metal housing that may be part of the receiver/drier assembly or mounted directly along the liquid line near the firewall.
- In some designs, the orifice tube is integrated within the evaporator or its immediate inlet pathway, making it less accessible without removing parts of the dash or evaporator housing.
Because configurations vary widely, identifying the exact location requires checking the specific vehicle’s A/C diagrams or service manual. If you’re troubleshooting, avoid discharging refrigerant or attempting repairs without proper training and certification.
Notes for DIY inquiries and safety considerations
Working with automotive refrigerants can be hazardous and requires appropriate equipment and licenses in many regions. If the system is suspected of having a clogged or malfunctioning orifice tube, consult a qualified technician who can diagnose and service the system safely.
Summary
The orifice tube in most cars sits on the high‑pressure side of the A/C system, typically in the liquid line between the condenser and evaporator. Its exact location varies by design, ranging from a dedicated tube in the line to inclusion within a receiver/drier assembly or evaporator housing. For precise placement and service procedures, refer to the vehicle’s service manual and rely on a trained technician for any refrigerant work.
