Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
374 Vehicle Care
Overheated Engine
Protection
Operating Mode
If an overheated engine conditionexists and the ENGINE POWER ISREDUCED message displays, anoverheat protection mode whichalternates firing groups of cylindershelps to prevent engine damage. Inthis mode, a loss in power andengine performance will be noticed.This operating mode allows thevehicle to be driven to a safe placein an emergency. Driving extendeddistances and/or towing a trailer inthe overheat protection modeshould be avoided.
Caution
After driving in the overheated
engine protection operating
mode, the engine oil will be
severely degraded. Any repairs
performed before the engine is
cool may cause engine damage.
Allow the engine to cool before
(Continued)
Caution (Continued)
attempting any repair. Repair the
cause of coolant loss, change the
oil, and reset the oil life system.
SeeEngine Oil0359.
Engine Fan
If the vehicle has a clutched enginecooling fan, when the clutch isengaged, the fan spins faster toprovide more air to cool the engine.In most everyday driving conditions,the fan is spinning slower and theclutch is not fully engaged. Thisimproves fuel economy and reducesfan noise. Under heavy vehicleloading, trailer towing, and/or highoutside temperatures, the fan speedincreases as the clutch more fullyengages, so an increase in fannoise may be heard. This is normaland should not be mistaken as thetransmission slipping or makingextra shifts. It is merely the coolingsystem functioning properly. The fanwill slow down when additionalcooling is not required and theclutch disengages.
This fan noise may also be heardwhen starting the engine. It will goaway as the fan clutch partiallydisengages.
If the vehicle has electric coolingfan(s), the fans may be heardspinning at low speed during mosteveryday driving. The fans may turnoff if no cooling is required. Underheavy vehicle loading, trailer towing,high outside temperatures,or operation of the air conditioningsystem, the fans may change tohigh speed and an increase in fannoise may be heard. This is normaland indicates that the coolingsystem is functioning properly. Thefans will change to low speed whenadditional cooling is no longerrequired.
The electric engine cooling fansmay run after the engine has beenturned. off. This is normal and noservice is required.
Chevrolet Silverado Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9956065) - 2017 - CRC - 4/29/16
Service and Maintenance 453
ayearandtheoillifesystemmustbe reset. Your trained dealertechnician can perform this work.If the engine oil life system is resetaccidentally, service the vehiclewithin 5 000 km/3,000 mi since thelast service. Reset the oil lifesystem when the oil is changed.SeeEngine Oil Life System0362.
Passenger Compartment Air
Filter
The passenger compartment airfilter removes dust, pollen, andother airborne irritants from outsideair that is pulled into the vehicle.The filter should be replaced as partof routine scheduled maintenance.Inspect the passenger compartmentair filter every 36 000 km/22,500 miles or two years,whichever comes first. Replace ifnecessary. More frequentreplacement may be needed if thevehicle is driven in areas with heavytraffic, areas with poor air quality,or areas with high dust levels.
Replacement may also be needed ifthere is a reduction in air flow,excessive window fogging, or odors.
Tire Rotation and Required
Services Every 12 000 km/
7,500 mi
Rotate the tires, if recommended forthe vehicle, and perform thefollowing services. SeeTireRotation0412.
.Check engine oil level and oillife percentage. If needed,change engine oil and filter, andreset oil life system. SeeEngineOil0359andEngine Oil LifeSystem0362.
.Check engine coolant level. SeeEngine Coolant0369.
.Check windshield washer fluidlevel. SeeWasher Fluid0375.
.Visually inspect windshield wiperblades for wear, cracking,or contamination. SeeExteriorCare0441.Replacewornordamaged wiper blades. SeeWiper BladeReplacement0384.
.Check tire inflation pressures.SeeTire Pressure0405.
.Inspect tire wear. SeeTireInspection0411.
.Visually check for fluid leaks.
.Inspect engine air cleaner filter.SeeEngine Air Cleaner/Filter0367.
.Inspect brake system. SeeExterior Care0441.
