Four Seasons A/C Receiver Drier 33991
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Four Seasons A/C Receiver Drier 33991
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A/C Receiver Drier for 2016-2017 Kenworth T370 & More - Four Seasons 33991

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$92.99
MPN: 33991
Item Package Quantity: 1
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Four Seasons A/C Receiver Drier P/N:33991
Four Seasons A/C Receiver Drier P/N:33991
$92.99

Keep the refrigerant in your A/C system clean and dry with the Four Seasons A/C Receiver Drier / Filter Drier 33991, a steel filter drier that drops in as a direct-fit replacement for the 2016-2017 Kenworth T370, the 2010-2012 Peterbilt 325 and 330, and the 2010 Peterbilt 335 and 340. See the Buyer's Guide tab for engine-level fitment details.

  • Steel construction with quality welds: built for a durable, leak-free design.
  • High-quality desiccant: a desiccant bag absorbs moisture from the refrigerant for appropriate absorption.
  • Installation hardware included: the necessary gaskets, o-rings and seal are supplied for easier installation.

The filter drier acts as a filter, removing moisture and contaminants from the air conditioning system — debris that cannot be cleared by flushing, which is why replacing the drier is part of servicing the system. Because a leaking or open system can saturate the desiccant bag within hours, the drier should be replaced any time the A/C system is opened for service. Four Seasons also notes that replacing the drier is required to validate the compressor warranty.

Frequently Asked Questions

What does this receiver/filter drier do?

It acts as a filter, removing moisture and contaminants from the A/C refrigerant using a desiccant bag. These contaminants can't be cleared by flushing, so the drier handles them.

What is the drier made of?

It is a steel filter drier with quality welds for a durable, leak-free design.

Are any installation parts included?

Yes. Four Seasons includes the necessary gaskets, o-rings and seal to make installation easier.

When should I replace the drier?

Replace it any time the A/C system is opened for service. A leaking or open system can saturate the desiccant bag within a few hours, making the drier ineffective.

Which vehicles does part 33991 fit?

It fits the 2016-2017 Kenworth T370, 2010-2012 Peterbilt 325 and 330, and 2010 Peterbilt 335 and 340. Check the Buyer's Guide tab to confirm fitment for your vehicle.

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