Frequently Asked Questions About Freightliner FLT Cabover AC Driers & Compressors

What years and models of Freightliner FLT cabovers are these AC components compatible with?

Our AC driers and compressors are designed to fit Freightliner FLT cabover models from 1984 through 1991, including the FLT86 and FLT120 series. However, compatibility can vary based on your specific engine configuration and whether you have factory AC or an aftermarket system. We recommend checking your current compressor's part number or contacting us with your VIN to ensure proper fitment before ordering.

How difficult is it to replace the AC drier and compressor on an FLT cabover?

Replacing these components typically requires intermediate mechanical skills and takes 3-5 hours. The main challenges include limited access space in the cabover engine compartment and the need to properly evacuate and recharge the AC system. You'll need basic hand tools, a refrigerant recovery system, and a vacuum pump. Many customers report that removing the passenger-side access panels significantly improves workspace. Professional installation is recommended if you're not comfortable working with AC systems.

What's the difference between OEM and aftermarket compressors for FLT cabovers?

OEM compressors are original Sanden or York units that match factory specifications exactly, while aftermarket options from brands like Four Seasons or UAC offer similar performance at a lower price point. The main differences are durability and warranty coverage - OEM units typically last 15-20 years with proper maintenance, while aftermarket versions average 8-12 years. Both types will cool effectively, but OEM compressors tend to run quieter and have better clutch engagement.

Do I need to replace both the drier and compressor at the same time?

While not always mandatory, replacing both components together is strongly recommended. When a compressor fails, it often releases metal particles and debris into the AC system that get trapped in the drier. Installing a new compressor without replacing a contaminated drier can lead to premature compressor failure within 6-12 months. The relatively low cost of a new drier (typically $30-60) makes it cheap insurance for protecting your new compressor investment.

What are the signs that my FLT cabover's AC compressor or drier needs replacement?

Common compressor failure symptoms include loud grinding or squealing noises, AC clutch not engaging, warm air from vents despite proper refrigerant levels, or visible oil leaks around the compressor body. Drier failure signs include intermittent cooling, ice formation on AC lines, or moisture in the sight glass. If your AC system hasn't been serviced in over 5 years or has required multiple recharges, the drier should be replaced as preventive maintenance since its moisture-absorbing capacity diminishes over time.