2006 Dodge Ram 1500 Pickup Owner's Manual - Page 446

446 MAINTAINING YOUR VEHICLE CRACKING DUE TO WEATHERING DOES NOT ADVERSELY AFFECT PERFORMANCE. If, however, excessively deep localized cracks are present, or any part of the exhaust system abnormally contacts the underbody hardware, the isolator and/or hanger should be replaced. Cooling System Cooling System Maintenance At the intervals shown in the Maintenance Schedules Section of the manual, the system should be drained, flushed and filled. Inspection Check engine coolant (antifreeze) protection every 12 months (before the onset of freezing weather, where applicable). If coolant is dirty or rusty in appearance, the system should be drained, flushed and refilled with fresh coolant as specified. Inspect the entire cooling system for leaks. Check the face of the radiator for any accumulation of bugs, leaves, or other foreign matter. If dirty, clean the radiator core with a garden hose. With the engine OFF, gently spray water from the back of the radiator core. For 3.7L, 4.7L, and 5.7L engines, check the coolant bottle hoses for condition and tightness of the connections at both the coolant bottle and radiator. Coolant Level ( 3.7L, 4.7L, 5.7L Engines) The coolant reserve system provides a quick visual method of determining that the coolant level is adequate. With the engine idling, and warmed to the normal operating temperature, the level of the coolant in the coolant bottle should be between the fluid level marks. Check the coolant level whenever the hood is raised.