Global Parts 3411306 A/C Expansion Valve - Rear

A/C Expansion Valve for Rear HVAC Service

Global Parts 3411306 is an A/C expansion valve for rear HVAC systems. It meters refrigerant flow before the evaporator so the system can use refrigerant cooling more effectively. This part is a direct service item for Chevrolet Astro, GMC Safari, and Oldsmobile Silhouette rear air conditioning applications.

• Type: 16mm x 20mm
• 11" capillary tube
• Right angle valve design
• Rear HVAC application
• Global Parts part number 3411306

Fitment and Cross References

Compatible With 1994-2005 Chevrolet Astro, rear. Compatible With 1994-2005 GMC Safari, rear. Compatible With 1994-1996 Oldsmobile Silhouette, rear. This part cross-references Four Seasons 38908 for the same application.

How It Works

The expansion valve regulates refrigerant entering the evaporator, helping maintain proper pressure drop and refrigerant distribution across the cooling circuit. On rear A/C systems, correct refrigerant metering is important for stable vent temperatures and consistent cabin cooling. Global Parts 3411306 is built for the rear HVAC layout used in these GM vans and minivans.

Common Problems This Part Can Address

• Weak rear A/C cooling
• Incorrect refrigerant flow at the evaporator
• Temperature fluctuations from a restricted valve
• Service-related contamination in the A/C metering circuit
• Reduced cooling performance in Chevrolet Astro, GMC Safari, and Oldsmobile Silhouette rear systems

Installation Notes and Tips

Replace the expansion valve during A/C service when the system has been opened or contaminated. Verify the valve style, capillary length, and connection size before installation. Proper evacuation, leak checking, and refrigerant recharge are required after service. Confirm rear HVAC routing on 1994-2005 Chevrolet Astro and GMC Safari, and on 1994-1996 Oldsmobile Silhouette, before final assembly.

Quality Assurance

Global Parts recommends replacing the expansion valve/orifice tube each time the A/C system is serviced to help maintain proper refrigerant control and cooling performance.