As the truck is driven overtime; road debris, bugs, oils,tar and lots of other debris will restrict air flow and cause your truck to run hot. This common issue can arise when you prolong the cleaning of the cooling system "stack". The stack refers to the radiator, intercooler, air conditioning condenser, and the transmission cooler mounted behind the grill. Learn how to clean the "stack" and more by watching the video below. | Merchant Automotive, LLC