Buick 2001 Century - Manual (Page 138)

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Engine Coolant Temperature Gage
You have a gage that
shows the engine coolant
temperature. If the gage
pointer moves into the red
area, your engine is too hot!
That reading means the same thing as the warning light.
It means that your engine coolant has overheated. If you
have been operating your vehicle under normal driving
conditions, you should pull off the road, stop your
vehicle and turn off the engine as soon as possible.
See “Engine Overheating” in the Index.
Low Coolant Warning Light
If the LOW COOLANT light comes on, your system
is low on coolant and the engine may overheat. See
“Engine Coolant” in the Index and have your vehicle
serviced as soon as you can.
The light will come on
briefly when your ignition
is turned on to show you
that it is working properly.