5-19Engine Fan NoiseYour vehicle has a clutched engine cooling fan.When the clutch is engaged, the fan spins faster toprovide more air to cool the engine. In most everydaydriving conditions, the fan is spinning slower and theclutch is not fully engaged. This improves fuel economyand reduces fan noise. Under heavy vehicle loading,trailer towing and/or high outside temperatures, thefan speed increases as the clutch more fully engages.So you may hear an increase in fan noise. This isnormal and should not be mistaken as the transmissionslipping or making extra shifts. It is merely the coolingsystem functioning properly. The fan will slow downwhen additional cooling is not required and theclutch disengages.You may also hear this fan noise when you startthe engine. It will go away as the fan clutchpartially disengages.If a Tire Goes FlatIt’s unusual for a tire to “blow out” while you’re driving,especially if you maintain your tires properly. If air goesout of a tire, it’s much more likely to leak out slowly.But if you should ever have a “blowout,” here are a fewtips about what to expect and what to do:If a front tire fails, the flat tire will create a drag thatpulls the vehicle toward that side. Take your foot offthe accelerator pedal and grip the steering wheel firmly.Steer to maintain lane position, and then gently braketo a stop well out of the traffic lane.A rear blowout, particularly on a curve, acts much like askid and may require the same correction you’d use ina skid. In any rear blowout, remove your foot fromthe accelerator pedal. Get the vehicle under control bysteering the way you want the vehicle to go. It maybe very bumpy and noisy, but you can still steer.Gently brake to a stop -- well off the road if possible.If a tire goes flat, the next part shows how to use yourjacking equipment to change a flat tire safely.