Four Seasons 38638 A/C Orifice Tube - Front

Reliable A/C Orifice Tube for Select GM and Saab Vehicles

The Four Seasons Orifice Tube 38638 is a critical component designed to regulate refrigerant flow in automotive air conditioning systems. Engineered for compatibility with various Buick, Cadillac, Chevrolet, GMC, Hummer, Oldsmobile, Pontiac, and Saab models, this black standard-style orifice tube ensures precise expansion and optimal A/C performance.

• Part Number: 38638
• Brand: Four Seasons
• Brand Line: Orifice Tube
• Color: Black
• Orifice Diameter: 0.072 inches (1.803 to 1.854 mm)
• Pack Quantity: 1
• Style: Standard
• Type: A/C Orifice Tube (Expansion Device)

About the Four Seasons Orifice Tube Product Line

The Four Seasons Orifice Tube line focuses on providing reliable expansion devices that control refrigerant flow within automotive A/C systems. This product line is designed to meet OEM specifications for a wide range of vehicles, ensuring proper system pressure and temperature regulation. The 38638 orifice tube is part of this line, offering a standard style orifice tube suitable for climates with typical temperature ranges, with an optional part (38903) recommended for climates above 105°F.

Product Details and Specifications

This A/C orifice tube features a precise orifice diameter of 0.072 inches (approximately 1.8 mm), which is essential for maintaining the correct refrigerant flow rate and pressure drop in the system. The black finish and standard style design make it compatible with many General Motors and Saab vehicles, including models such as the Chevrolet Silverado 1500, GMC Sierra 2500 HD, Cadillac Escalade, Buick Park Avenue, Pontiac Grand Am, and Saab 9-7x. The part is packaged individually for easy replacement and maintenance.

Common Applications and Issues Addressed

• Regulates refrigerant flow in A/C systems for consistent cooling performance
• Prevents compressor damage caused by improper refrigerant pressure
• Helps resolve issues with fluctuating cabin temperatures
• Addresses A/C system inefficiencies due to clogged or damaged orifice tubes
• Supports proper expansion and phase change of refrigerant in the evaporator

Installation Notes and Tips

When installing the Four Seasons Orifice Tube 38638, ensure the system is properly evacuated and free of contaminants. Verify compatibility with your vehicle’s make and model before installation. The orifice tube should be installed in the correct orientation within the A/C line to maintain system integrity. For vehicles operating in climates above 105°F, consider the optional part number 38903 for enhanced performance. Always follow manufacturer guidelines and safety procedures during installation.

Quality Assurance and Warranty

Four Seasons products are manufactured to meet or exceed OEM standards, ensuring reliable performance and durability. The Orifice Tube 38638 undergoes rigorous quality control to maintain consistent specifications. While specific warranty details are not provided here, Four Seasons typically offers limited warranties on their HVAC components. Consult product documentation or the manufacturer for exact warranty terms.