Four Seasons 38640 A/C Orifice Tube - Rear

Four Seasons 38640 A/C Orifice Tube

The Four Seasons 38640 is a standard A/C orifice tube for HVAC flow restriction in the rear air conditioning system. It uses a 0.047 in. orifice diameter and is identified by a brown color for service identification.

Key Features

• Four Seasons Orifice Tube line for A/C flow restriction service
• Standard style expansion device for rear HVAC applications
• 0.047 in. orifice diameter for controlled refrigerant metering
• Brown color for quick identification during A/C repair
• Fits Ford Aerostar rear A/C applications from 1986-1997
• Part number 38640 for catalog and cross-reference lookup

Product Details

Four Seasons 38640 is an A/C orifice tube used in rear HVAC systems to regulate refrigerant flow through the expansion circuit. This part is listed for 1986-1989 Ford Aerostar, rear, with factory air, and 1990-1997 Ford Aerostar, rear. The Four Seasons Orifice Tube product line focuses on service replacement flow restrictors for automotive air conditioning systems, and this unit is specified with a 0.047 inch orifice opening.

This part cross-references Monroe Shocks & Struts (e.g., 182237) for the same application.

Common Repair Uses

• Restoring proper refrigerant metering in the rear A/C circuit
• Addressing weak or uneven cooling performance in Ford Aerostar rear HVAC systems
• Replacing a restricted or contaminated orifice tube during A/C service
• Correcting flow issues that can affect compressor cycling and cabin outlet temperature

Installation Notes

Verify the existing tube style and match the rear application before installation. The printed foot note lists an optional AAOT part number 38902, and for climates above 105°F it specifies severe-duty AAOT 38904. Confirm the vehicle is a Ford Aerostar with rear A/C before ordering, and inspect the system for debris or contamination that could affect the new tube.

Quality Assurance

Four Seasons catalogs this part as a standard replacement A/C orifice tube for the listed Ford Aerostar applications. Use the part number 38640 and the vehicle fitment details to confirm the correct service part for rear HVAC repair.