Four Seasons A/C Receiver Drier 33478
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Four Seasons A/C Receiver Drier 33478
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Four Seasons A/C Receiver Drier P/N:33478

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$40.99
MPN: 33478
Item Package Quantity: 1
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Four Seasons A/C Receiver Drier P/N:33478
Four Seasons A/C Receiver Drier P/N:33478
$40.99

Keep your A/C system dry and clean with the Four Seasons A/C Receiver Drier, MPN 33478 — a steel filter drier that removes moisture and contaminants the refrigerant circuit picks up. It drops in as a direct-fit replacement across a wide range of Kenworth trucks, including the C500, K100E, K300, T300, T600A, T660, T800 and W900 — see the Buyer's Guide tab for the full year-by-year list.

  • Filters and dries: Acts as a filter, removing moisture and contaminants from the air conditioning system — debris that flushing alone cannot clear, which is why replacing the drier is essential during service.
  • Desiccant absorption: A desiccant bag absorbs moisture in the system; a leaking or open system can saturate the bag within hours, so a fresh unit restores proper drying capacity.
  • Durable, leak-free build: Quality welds and high-quality desiccant are produced in an ISO/TS16949 & ISO14001 certified facility for long-lasting performance.
  • Installation hardware: Necessary gaskets, o-rings and seal are included for easier installation.

Replacing the receiver drier is required to validate the compressor warranty and should be done anytime the system is opened for service. Backed by Four Seasons' 50-plus years of mobile A/C experience.

Frequently Asked Questions

What does this receiver drier do?

It acts as a filter, removing moisture and contaminants from the A/C system. A desiccant bag absorbs moisture, protecting the circuit from debris that flushing cannot remove.

Does it come with installation hardware?

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

Why should I replace the drier when servicing the A/C?

Replacing the drier is required to validate the compressor warranty and is recommended anytime the system is opened, since a saturated desiccant bag can no longer absorb moisture.

What is this drier made of?

It is a steel filter drier, built with quality welds and high-quality desiccant in an ISO/TS16949 and ISO14001 certified facility.

Which vehicles does MPN 33478 fit?

It fits a wide range of Kenworth trucks such as the C500, K100E, K300, T300, T600A, T660, T800 and W900. Check the Buyer's Guide tab for the complete year-by-year list.

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