Peterbilt 587 AC Driers & Compressors

Frequently Asked Questions About Peterbilt 587 AC Driers & Compressors

What does the AC drier do, and how do I know if mine needs to be replaced?

The AC drier (also called a receiver drier or accumulator) removes moisture and contaminants from the refrigerant circulating through your air conditioning system. If your AC is blowing warm air, cycling inconsistently, or you notice frost buildup on AC lines, the drier may be saturated or failing. It is also standard practice to replace the drier any time the AC system is opened up for repair, since it is a low-cost part that protects your compressor from moisture damage.

Will this compressor or drier fit my Peterbilt 587 without modification?

Products listed in this category are intended to fit the Peterbilt 587, but AC components can vary depending on engine option, cab configuration, and the model year of your truck. Always check the fitment notes on each product listing and compare part numbers with your existing component before ordering to confirm it matches your specific truck's setup.

Can I install an AC compressor or drier myself, or should I have a shop do it?

Replacing an AC drier is a job many experienced technicians and DIY-minded owner-operators can handle, but it requires proper recovery and recharging of refrigerant using EPA-approved equipment, which most home garages do not have. Compressor replacement is more involved, often requiring the system to be evacuated, the compressor mounted and torqued to spec, and the system flushed, recharged, and leak-tested afterward. If you do not have access to refrigerant recovery and charging equipment, we recommend having a qualified diesel AC technician perform the installation.

Do I need to replace other AC components at the same time as the compressor or drier?

When replacing a compressor, it is common practice to also replace the drier and add the correct type and amount of refrigerant oil, since debris from a failed compressor can contaminate the rest of the system. Skipping this step can lead to premature failure of the new compressor. If your old compressor failed due to contamination or a leak, inspect the condenser, hoses, and orifice tube or expansion valve as well before recharging the system.

What is the difference between a new, remanufactured, and OEM compressor or drier?

New parts are built from scratch and typically carry the longest warranty coverage. Remanufactured units are rebuilt from cores using new wear components and are tested to meet original specifications, offering a lower-cost alternative with reliable performance. OEM parts are made to the exact specifications set by Peterbilt, while aftermarket options are built to match fit and function at a different price point. Check each listing for warranty terms and part origin so you can choose the option that best fits your budget and how long you plan to keep the truck.