1994 Chevrolet Blazer Owner's Manual - Page 220

Engine Fan Noise This vehicle has a clutched engine cooling fan. When the clutch isengaged, the fan spins fasterto provide more air to cool the engine. In most every day driving conditions the clutch is not engaged. This improves fuel economy and reduces fan noise.Under heavy vehicle loading, trailer towingand/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 notbe mistaken as the transmission slipping or making extra shifts. It is merely the cooling system functioning properly. The fan 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'redriving, especially if you to maintain your tires properly. Ifair goes out ofa tire, it's much more likely leak out slowly. But if you should ever have a "blowout," here are a few tips about what to expect and what to do: If a front tire fails, the flat tire will 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, then gently braketo 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. In any rear blowout, remove by your foot from the accelerator pedal. Get the vehicle under control steering the way you want the vehicle to go. It may be very bumpy and noisy, but you can still steer. Gently braketo a stop, well off the road if possible. If a tire goes flat, the next section shows how to use yourjacking equipment to change a flat tire safely. 5-18