Pontiac Sunbird Owner's Manual page 177

Problems on the Road
Engine Overheating
(CONT:)
2. Then keep turning the cap, but now
push down as you turn it. Remove the
pressure cap.
1 7 6
3.
Fill the coolant surge tank with the
proper mix, up to FULL COLD.
4. With the coolant surge tank pressure
~
cap off, start the engine and let it run
until you can feel the upper radiator
hose getting hot. Watch out for the
engine fan.
I
By this time, the coolant level inside the
coolant surge
tank
may be lower. If the
level is lower, add more of the proper
mix to the coolant surge
tank
until the
level reaches
m7LL
COLD.