Four Seasons 33399 A/C Receiver Drier

Four Seasons 33399 Filter Drier Overview

The Four Seasons 33399 A/C receiver drier is a steel filter drier built for HVAC service on select Mercedes-Benz models. It uses a male insert O-ring inlet and outlet, includes desiccant, and features a sight glass and switch port for system monitoring.

As part of the Four Seasons Filter Drier line, this receiver drier is a new, OE-style replacement that meets or exceeds OEM requirements for the listed applications. It is a direct-fit option for Mercedes-Benz 300SD, 380SEC, 380SEL, 380SE, 500SEC, and 500SEL service work.

Key Features

• Brand: Four Seasons
• Part number: 33399
• Steel filter drier construction
• Male insert O-ring inlet and outlet fittings
• Desiccant included; desiccant is not replaceable
• Sight glass included
• Fuse plug included
• Switch port included; no service port
• Washer not included
• Meets or exceeds OEM specifications

Fitment Details

• Fits 1978-1985 Mercedes-Benz 300SD, N/A
• Fits 1982-1983 Mercedes-Benz 380SEC, N/A
• Fits 1981-1983 Mercedes-Benz 380SEL, N/A
• Fits 1984-1985 Mercedes-Benz 380SE, N/A
• Fits 1984-1985 Mercedes-Benz 500SEC, N/A
• Fits 1984-1985 Mercedes-Benz 500SEL, N/A

What This Receiver Drier Helps Address

• Moisture contamination in the A/C system
• Debris accumulation in the refrigerant circuit
• Reduced cooling performance from a saturated drier
• Service issues related to aging or failed receiver drier components
• System inspection needs through the integrated sight glass

Installation Notes and Tips

Confirm inlet and outlet sizing before installation: both connections are 3/8 inch male insert O-ring style. The body measures 3.000 inches in diameter and 6.500 inches in length, so verify available mounting space on the vehicle before service. Replace O-rings and seals as needed during A/C repair, and evacuate and recharge the system according to factory procedures after installation.

This part cross-references Monroe Shocks & Struts 172451 for the same application.

Quality Assurance

Four Seasons lists this receiver drier as a new part that meets or exceeds OEM requirements. The steel construction, included desiccant, and OE-style connector design support proper A/C system service on the specified Mercedes-Benz applications.