Chevrolet Silverado 2004 Owner's Manual page 439

How to Add Coolant to the Coolant
Surge Tank for Gasoline Engines
If you haven't found a problem yet, check to see if
coolant is visible in the surge tank. If 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
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 5-35 for
more information.
If no coolant is visible in the surge tank, add coolant
as follows:
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 coolant
surge tank pressure cap — even a little — they
can come out at high speed. Never turn the
cap when the cooling system, including the
coolant at the coolant
CAUTION: (Continued)
CAUTION: (Continued)
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.
5-43