Four Seasons A/C Receiver Drier 33531
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Four Seasons A/C Receiver Drier 33531
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Four Seasons A/C Receiver Drier P/N:33531

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$32.99
MPN: 33531
Item Package Quantity: 1
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Four Seasons A/C Receiver Drier P/N:33531
Four Seasons A/C Receiver Drier P/N:33531
$32.99

Keep the refrigerant clean and dry in your heavy-duty A/C system with the Four Seasons A/C Receiver Drier (Steel Filter Drier), MPN 33531. It installs as a direct-fit replacement for the 1985-1989 Mack MS200P, MS250P, MS300P and MS300T Mid-Liner, plus the 1981-1993 Peterbilt 362 and 1989-1993 Peterbilt 372 — see the Buyer's Guide tab for engine-level details.

The receiver drier acts as a filter, using an internal desiccant to absorb moisture and trap contaminants that circulate through the air conditioning system — debris that cannot be removed by flushing, which is why the drier is replaced whenever the system is opened or serviced.

  • Steel construction: a steel filter drier built with quality welds for a durable, leak-free design.
  • Desiccant filtration: high-quality desiccant absorbs moisture while the unit filters out contaminants from the refrigerant.
  • Installation hardware: the necessary gaskets, o-rings and seal are included for the installation.
  • Backed by experience: produced in an ISO/TS16949 & ISO14001 certified facility and backed by over 50 years of Four Seasons mobile A/C experience.

Signs the original drier may need replacing include a saturated desiccant from a leaking or open system and reduced A/C performance after service. Replacing the drier is also required to validate many compressor warranties.

Frequently Asked Questions

What does this receiver drier do?

It acts as a filter in the A/C system, using an internal desiccant to absorb moisture and trap contaminants from the refrigerant — debris that flushing cannot remove.

What is it made of?

Per Four Seasons, this is a steel filter drier built with quality welds for a durable, leak-free design and filled with high-quality desiccant.

Does it come with installation hardware?

Yes. The necessary gaskets, o-rings and seal are included for the installation.

Which vehicles does MPN 33531 fit?

It fits the 1985-1989 Mack MS200P, MS250P, MS300P and MS300T Mid-Liner, plus the 1981-1993 Peterbilt 362 and 1989-1993 Peterbilt 372. See the Buyer's Guide tab.

When should the drier be replaced?

Whenever the A/C system is opened or serviced. A leaking or open system can saturate the desiccant within hours, and replacing the drier is often required to validate compressor warranties.

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