2005 Dodge Durango Owner's Manual - Page 329

MAINTAINING YOUR VEHICLE 329 D. Maintain coolant concentration at 50% HOAT ethylene glycol engine coolant (minimum) and distilled water for proper corrosion protection of your engine. 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 swelling suggest deterioration of the rubber. Particular attention should be given to examining hose surfaces nearest to high heat sources, such as the exhaust manifold. Insure nylon tubing in these areas has not melted or collapsed. Inspect all hose clamps and couplings to make sure they are secure and no leaks are present. NOTE: Fluids such as oil, power steering fluid, and brake fluid are used during assembly plant operations to ease the assembly of hoses to couplings. Therefore, oil wetness at the hose-coupling area is not necessarily an indication of leakage. Actual dripping of hot fluid when systems are under pressure (during vehicle operation), should be noted before hose is replaced based on leakage. 7