Frequently Asked Questions About International 9900/i/ix AC Driers & Compressors

What years and models of International 9900 trucks are these AC components compatible with?

Our AC driers and compressors are designed to fit International 9900, 9900i, and 9900ix models from 1998 through 2017. The 9900i models (2000-2004) and 9900ix models (2005-2017) share similar AC system configurations, but always verify your specific VIN and engine type before ordering. Pre-2000 9900 models may require different fittings or adapters depending on whether you have a Caterpillar, Cummins, or Detroit engine.

How difficult is it to replace the AC drier and do I need special tools?

Replacing an AC drier typically takes 1-2 hours and requires basic hand tools plus AC-specific equipment. You'll need a manifold gauge set, vacuum pump, and refrigerant recovery system. The drier is usually mounted on the passenger side firewall and requires disconnecting the AC lines, which means you must evacuate the system first. Many drivers choose professional installation due to EPA regulations regarding refrigerant handling, which typically costs $150-300 for labor.

What's the difference between standard and heavy-duty AC compressors for these trucks?

Standard compressors are adequate for typical over-the-road applications and cost less, while heavy-duty units feature reinforced internal components and larger clutches designed for extreme heat conditions or trucks with sleeper units running APUs. Heavy-duty compressors typically last 200,000-300,000 miles versus 150,000-200,000 for standard units. If you operate in the Southwest, pull heavy loads, or idle frequently, the heavy-duty option provides better long-term value.

Why does my new AC drier come with a sight glass and should I use it?

The sight glass allows you to monitor refrigerant flow and check for moisture contamination (bubbles indicate low refrigerant or moisture). While not all original International 9900 systems included sight glasses, adding one during replacement helps with future diagnostics. Install it in the liquid line between the condenser and expansion valve for best results. The slight additional cost (usually $20-40) pays for itself by making system troubleshooting much easier.

What are the most common installation mistakes that cause premature failure?

The top three installation errors are: not replacing the accumulator/drier when changing the compressor (moisture contamination kills new compressors), using incorrect oil type or quantity (PAG 46 or PAG 100 depending on your system), and failing to properly evacuate the system before recharging. Also, many installers forget to check belt alignment - misaligned belts cause clutch bearing failure within 10,000-20,000 miles. Always flush the entire system when replacing a failed compressor to remove debris.