You can be burned if you spill coolant on hot; engine parts. Coolant contains ethylene glycol; and it will burn if the engine parts are hot- Page 217

First Edition for Buick LeSabre Owner’s Manual – 1999

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CAUTION:

You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol
and it will burn if the engine parts are hot
enough. Don’t spill coolant on a hot engine.

When the coolant in the coolant recovery tank is at the
FULL COLD mark, start your vehicle.

If the overheat warning continues, there’s one more
thing you can try. You can add the proper coolant
mixture directly to the radiator, but be sure the cooling
system is cool before you do it.

CAUTION:

Steam and scalding liquids from a hot cooling
system can blow out and burn you badly. They
are under pressure, and if you turn the radiator
pressure cap 

--

 even a little 

--

 they can come out

at high speed. Never turn the cap when the
cooling system, including the radiator pressure
cap, is hot. Wait for the cooling system and
radiator pressure cap to cool if you ever have to
turn the pressure cap.