International 4700 & 4900 Charge Air Coolers – Keeping Your Rig Running Strong If you are out on the road in the summertime in the International 4700 or 4900, you will need power and as such, a charge air cooler (CAC) comes in handy. It improves the combustion process by cooling the air before it enters the engine. If your unit is old and worn out, investing in an aftermarket charge air cooler will help you in the long run. It's just as important for you to upgrade your entire cooling system with proper International 4700-4900 radiator parts or even some upgrades to your airflow with commercial semi truck exhaust parts. It's also important to remember that your truck's overall cooling efficiency is heavily impacted by the airflow from an