Kenworth T300-T450 AC Driers & Compressors

Frequently Asked Questions About Kenworth T300-T450 AC Driers & Compressors

How do I know if I need an AC drier or a compressor, or both?

The AC drier (receiver drier) filters moisture and contaminants from the refrigerant and is typically replaced whenever the AC system is opened up for service, such as during a compressor swap. The compressor is the component that pressurizes refrigerant to circulate it through the system. If your AC is blowing warm air, cycling on and off unexpectedly, or making unusual noises from the front of the engine, the compressor may be failing. If the system has been opened for any repair or has sat empty for a long period, the drier should be replaced regardless of whether the compressor is being serviced. When in doubt, have a qualified technician diagnose the system before ordering parts.

Will this AC drier or compressor fit my specific Kenworth T300, T440, or T470 model and year?

Kenworth used different AC system configurations across the T300-T450 model range and production years, so fitment can vary even within the same model line. Always check the listed year range, engine option, and any OEM part number cross-reference on the product page before purchasing. If you are unsure, have your VIN and current part number on hand and contact our parts team to confirm compatibility before installing.

Do I need to evacuate and recharge the AC system after replacing the drier or compressor?

Yes. Any time the AC system is opened to replace a drier or compressor, it must be properly evacuated to remove air and moisture, then recharged with the correct type and amount of refrigerant. This requires certified AC recovery and charging equipment. This is not a job that can be completed with basic hand tools, so most customers have this portion of the installation done by a shop equipped for mobile AC service.

Should I replace the AC drier every time I replace the compressor?

In most cases, yes. The drier is a low-cost part relative to the compressor, and installing a new one whenever the system is opened helps protect the new compressor from moisture and debris that can cause premature failure. Reusing an old drier after a compressor replacement is a common cause of repeat AC failures.

Are these AC driers and compressors new, remanufactured, or OEM parts?

Product listings in this category note whether an item is new or remanufactured, along with any applicable brand information. Check the specific product page for these details, including any core charge that may apply to remanufactured compressors. If you have questions about a particular listing before ordering, our parts team can help confirm what you are getting.