Cadillac XT4 Owner's Manual page 299

298 VEHICLE CARE
Check to see if coolant is visible in the
coolant surge tank. If the coolant
inside the coolant surge tank is
boiling, do not do anything else until
it cools down. If coolant is visible but
the coolant level mark is not at or
above the indicated mark, add a
50/50 mixture of clean, drinkable
water and DEX-COOL coolant. Be sure
the cooling system is cool before this
is done. See Engine Overheating 0 299.
The coolant surge tank is in the
engine compartment on the driver
side of the vehicle. See Engine
Compartment Overview 0 288.
How to Add Coolant to the
Surge Tank
Warning
Spilling coolant on hot engine parts
can burn you. Coolant contains
ethylene glycol and it will burn if
the engine parts are hot enough.
Warning
Steam and scalding liquids from a
hot cooling system are under
pressure. Turning the pressure cap,
even a little, can cause them to jet
out at high speed and you could be
burned. Never turn the cap when
the cooling system, including the
pressure cap itself, is hot. Wait for
the cooling system and pressure
cap to cool.
Caution
Failure to follow the specific
coolant filling procedure could
cause the engine to overheat and
Caution (Continued)
could cause system damage.
If coolant is not visible in the surge
tank, contact your retailer.
The coolant surge tank pressure cap
can be removed when the cooling
system, including the surge tank
pressure cap and upper radiator hose,
is no longer hot.
1. Turn the pressure cap slowly
anticlockwise. If a hiss is heard,
wait for that to stop. A hiss means
there is still some pressure left.
2. Keep turning the pressure cap
slowly and remove it.