INSTRUMENTS AND CONTROLS 123Boost Gauge (PerformanceConfiguration Only)Metric 6.2 engine (LT4) shown, 3.6Lengine (LF3) similarThis gauge indicates boost underheavier throttle.It displays the air pressure level in theintake manifold before it enters theengine's combustion chamber.The gauge is automatically centered atzero every time the engine is started.Actual boost is displayed from thiszero point. Changes in ambientpressure, such as driving in mountainsand changing weather, will slightlychange the zero reading.Engine CoolantTemperature GaugeBase LevelUplevel Balanced ConfigurationThis gauge measures the enginecoolant temperature.The warning area at the far end of thegauge may appear shaded or may becolored red.If the pointer approaches the warningarea, or the shaded thermostat symbolthe engine may be too hot.Under some driving conditions,including those listed below, it isnormal for the temperature to riseabove the usual operating range andapproach the far end of the gauge:. Stop and go driving in heavytraffic.
