1997 Chevrolet Blazer Owner's Manual - Page 239

Engine Fan Noise This vehicle has a clutched engine cooling fan. When the clutch is engaged, the fan spins fasterto provide more air to cool the engine. In most everyday driving conditions, the clutch is not engaged. This improves fuel economy and reduces fan noise. Under heavy vehicle loading, trailer towing and/or high outside temperatures. the fan speed increases when the clutch engages. So you may hear an increase in fan noise. This is normal and should not be mistaken as the transmission slipping or making extra shifts. It is merely the cooling system functioning properly. The fa11 will slow down when additional cooling is not required and the clutch disengages. You may also hear this fan noise when you start the engine. It will go away as the fan clutch disengages. If a Tire Goes Flat It's unusual for a tire to "blow out" while you're driving. especially if you maintain your tires properly. I f air goes o u t of a tire, it's much Inore likely to leak out slowly. But if you should ever have ; "blowout." here are a few I tips about what to expect and what to do: If a front tire fails. the flat tire w i l l create a drag that pulls the vehicle toward that side. Take your foot off the accelerator pedal and grip the steering wheel firmly. Steer to maintain lane position. and then gently brake to a stop well out of the traffic lane. A rear blowout. particularly on a curve. acts much like a skid and may require the same correction you'd use in a skid. I n any rear blowout. remove your foot from the xcelerator pedal. Get the \,chicle under control by steering the way you want the vehicle to go. It may be \.cry bunlpy and noisy. but you can still steer. Gently brake to a stop -- well off the road if possible. 5-22