Western Star 5700XE Truck AC Driers & Compressors

Frequently Asked Questions About Western Star 5700XE Truck AC Driers & Compressors

What do the AC drier and compressor actually do in my Western Star 5700XE?

The AC compressor pressurizes and circulates refrigerant through the system, while the AC drier (also called a receiver drier) removes moisture and contaminants from the refrigerant before it reaches the expansion valve. Together they keep your cab AC running efficiently and help protect the rest of the system from moisture-related corrosion and clogging.

How do I know if my compressor or drier needs to be replaced?

Common signs include weak or warm airflow from the vents, unusual noises coming from the compressor when the AC is engaged, visible oil residue around fittings, or the AC system cycling on and off rapidly. If your system has recently been opened for repair, it is also common practice to replace the drier since it can no longer effectively remove moisture once exposed to open air.

Will these parts fit my specific Western Star 5700XE model year?

AC drier and compressor part numbers can vary by model year, engine option, and cab configuration. Always check the listed specifications and part numbers against your truck's original equipment before ordering, and compare against your VIN or existing part number if you are unsure. If you have questions about fitment, our team can help confirm compatibility before you buy.

Can I install a new AC compressor or drier myself, or does it require a certified technician?

Because AC systems use pressurized refrigerant, any work that involves opening the system, such as replacing a compressor or drier, should be performed by a technician certified to handle refrigerant under EPA Section 609 requirements. Attempting to open the system without proper certification and recovery equipment is not legal and can damage components if not done correctly.

Do I need to replace anything else when installing a new compressor or drier?

When replacing a compressor, it is common to also replace the drier since moisture and debris can circulate through the system and reach the new compressor. Many technicians also recommend flushing the system, replacing the orifice tube or expansion valve if applicable, and adding the correct amount of refrigerant oil to match the new compressor. Following the recommended service procedure helps extend the life of your new parts.