Chevrolet 2003 Silverado 1500 Pickup Owner's Manual page 416

How to Add Coolant to the Coolant
Surge Tank Gasoline Engines
If you haven't found a problem yet, check to see if
coolant is visible
in
the surge tank. lf coolant is visible
but the coolant level isn't at or above the FULL
COLD mark, add a 50/50 mixture of clean, drinkable
water and DEX-COOL@ coolant at the coolant
surge tank, but be sure the cooling system, including
the coolant surge tank pressure cap, is cool before you
do it. See Engine Coolant on page 5-33 for more
information.
If no coolant is visible in the surge tank, add coolant as
follows:
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 coolant
surge tank pressure cap
--
even a little
--
they
CAUTION: (Continued)
~
can come out a- . i g h speed.
-
-3wer turr. --le
cap when the cooiing system, including the
coolant surge tank pressure cap, is hot. Wait
for the cooling system and coolant surge tank
pressure cap to cool if you ever have to turn
the pressure cap.
5-41