- Home
- Kenworth Parts
- Kenworth W900A Parts
- Kenworth W900A Engine Parts & Cooling
- Kenworth W900A AC Driers & Compressors
Kenworth W900A AC Driers & Compressors
Frequently Asked Questions About Kenworth W900A AC Driers & Compressors
Will these AC driers and compressors fit my specific year Kenworth W900A?
Most AC driers and compressors for the W900A are compatible with models from 1961-1990, but there are variations depending on your engine type and AC system configuration. We recommend checking your existing part numbers or contacting us with your VIN to ensure proper fitment. Pay special attention if you have a retrofit AC system, as these may require different components than factory-installed systems.
What's the difference between OEM and aftermarket AC compressors for my W900A?
OEM compressors typically use Sanden or York-style units that match original specifications exactly, while aftermarket options often feature updated designs with improved efficiency and durability. Aftermarket compressors usually cost 30-50% less than OEM but may require minor bracket modifications. Both options work well, but ensure any aftermarket unit matches your system's refrigerant type (R12 or R134a) and has the correct clutch configuration.
How difficult is it to replace the AC drier on a W900A, and what tools do I need?
Replacing an AC drier is a moderate difficulty job that takes 1-2 hours. You'll need basic hand tools, a refrigerant recovery system, and new O-rings. The main challenge is accessing the drier location behind the cab, which may require removing the battery box or air cleaner assembly. Always replace the drier when replacing the compressor or if the system has been open to atmosphere for more than a few hours.
My W900A originally had R12 - can I use these components with R134a refrigerant?
While many compressors work with both refrigerants, the drier and O-rings must be specifically rated for your refrigerant type. R134a conversions require a compatible drier with XH-7 or XH-9 desiccant, different O-rings, and proper system flushing. Never mix refrigerant types. If converting from R12 to R134a, plan to replace all system components including hoses and seals for optimal performance.
How do I know if my AC compressor is failing versus other AC system problems?
Common compressor failure signs include loud grinding or squealing noises, clutch not engaging, excessive oil leakage around the compressor shaft seal, or metal shavings in the refrigerant oil. Before replacing the compressor, verify the clutch is receiving power and the system has proper refrigerant charge. A seized compressor will prevent the clutch from turning by hand when disengaged. If the compressor failed internally, always flush the entire system and replace the drier to prevent contamination damage.