NOTE: Inspection and replacement should be performed any time a problem is observed or suspected. Severe usage conditions may require shorter intervals. Refer to the owner's manual for your truck.
Cooling system and heater hoses should be inspected carefully once a year for brittleness, cracks, softening, bulging, and heat damage from nearby exhaust system parts. Mitsubishi recommends that you replace all cooling system and heater hoses, every five years or 50,000 miles (80,000 km) on some early models. Refer to your owner's manual, if necessary.