EMERGENCY - How to inspect and replace a fuse 2. Check to ensure the Oil Pressure Gauge reads normal. 3. Make sure the engine fan is turning by switching the Engine Fan Switch from AUTO to MAN (Manual). 4. Increase the engine speed to about one-half of full operating speed, or 1,100 to 1,200 rpm, maximum for 2 or 3 minutes. 5. Return the engine speed to normal idle. Monitor the engine temperature. After the temperature returns to normal, allow the engine to idle 3 to 5 minutes before shutting it off. This allows the engine to cool gradually and uniformly. 6. If overheating came from severe operating conditions, the temperature should have cooled by this time.
If it has not, stop the engine and let it cool before checking to see if the coolant is low. 7. Be sure the vehicle is parked on level ground or the readings may be incorrect. Check the coolant level at the cooling module surge tank. Check the coolant level after each trip when the engine has cooled. The coolant level should be visible within the surge tank —add coolant if necessary. CAUTION 2 Prolonged periods of idling after the engine has reached operating temper- atures can decrease engine tempera- ture and could cause engine damage from inadequate lubrication. The nor- mal torsional vibrations generated can also cause transmission wear.
An idle shutdown feature, available on PAC- CAR engines, can be programmed to shut the engine down after a period of low idle operation with no driver activi- ty. A flashing warning lamp will inform the driver of an impending shutdown. Failure to comply may result in equip- ment or property damage. How to inspect and replace a fuse Use these steps to find blown electrical fuses or polyswitches. Turn the ignition off and turn all lights off. Locate the fuses in either the cab, sleeper or main power fuse box. All the electrical circuits have fuses to protect them from a short circuit or overload.
If something electrical on your chassis stops working, the first thing you should check for is a blown fuse. CAUTION If the truck is equipped with power take off (PTO) equipment, the engine shutdown system can be deactivated when the PTO is operational; however, engine idle periods should not exceed five minutes whenever possible. Fail- ure to comply may result in equipment or property damage. WARNING Do not replace a fuse with a fuse of a higher rating. Doing so may damage the electrical system and cause a fire. Failure to comply may result in death, personal injury, equipment or property damage. 44 Y53-6047-2HEN (03/18)