Buick RIVIERA 1993 Manual page 201

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CAUTION:
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Heater and radiator hoses, and other engine
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parts, can be very hot. Don't touch them. If you
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do, you can be burned.
Don't run the engine if there is a leak. If you run
the engine, it could lose all coolant. That could
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cause an engine fire, and you could be burned.
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Get any leak fixed before you drive the vehicle.
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CAUTION:
Adding only plain water to your cooling system
can be dangerous. Plain water, or some other
liquid like alcohol, can boil before the proper
coolant mix will. Your vehicle's coolant warning
system is set for the proper coolant mix. With
plain water or the wrong mix, your engine could
get too hot but you wouldn't get the overheat
warning. Your engine could catch fire and you
or others could be burned. Use a 5060 mix of
clean water and a proper antifreeze.