2004 Dodge Durango Owner's Manual - Page 311

MAINTAINING YOUR VEHICLE 311 The radiator normally remains completely full, so there is no need to remove the pressure cap except checking coolant freeze point or replacement with new antifreeze coolant. Your service attendant should be advised of this. When additional coolant is needed to maintain the proper level, it should be added to the coolant bottle. Do not overfill. Points To Remember A. Do not overfill the coolant bottle. B. Check coolant freeze point in the radiator and in the coolant bottle. If antifreeze needs to be added, contents of coolant bottle also must be protected against freezing. C. If frequent coolant additions are required, or if the level in the coolant bottle does not drop when the engine cools, the cooling system should be pressure tested for leaks. D. Maintain a minimum coolant concentration of 50% ethylene glycol. E. Make sure that the radiator and coolant bottle overflow hoses are not kinked or obstructed. F. Keep the front of the radiator clean. If your vehicle is equipped with air conditioning, keep the front of the condenser clean also. G. The thermostat should not be changed for summer or winter operation. If replacement is ever necessary, install ONLY the correct type thermostat. Other designs may result in unsatisfactory cooling performance. Emission Related Components Fuel System Hoses And Vapor/Vacuum Harnesses When the vehicle is serviced for scheduled maintenance, inspect surface of hoses and nylon tubing for evidence of heat and mechanical damage. Hard and brittle rubber, cracking, checking, tears, cuts, abrasions, and excessive 7