2005 Dodge Durango Owner's Manual - Page 328

328 MAINTAINING YOUR VEHICLE WARNING! The warning words "DO NOT OPEN HOT" on the coolant pressure cap are a safety precaution. Heat causes pressure to build up in the cooling system. To prevent scalding or injury, do not remove the pressure cap when the system is hot or under pressure. Coolant Level The coolant bottle system provides a quick visual method for determining that the coolant level is adequate. With the engine idling, and warmed to normal operating temperature, remove the cap from the bottle, remove the dipstick and wipe the excess coolant from it. Reinsert the dipstick and remove. Observe the dipstick checking the holes along the stem for coolant. Check the coolant level whenever the hood is raised. 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.