1999 Pontiac Grand Am Owner's Manual - Page 207
1999 Pontiac Grand Am Manual
Page 207 highlights
yellowblue 1. You can remove the coolant surge tank pressure cap when the cooling system, including the coolant surge tank pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise (left) about two or two and one-half turns and then stop. This will allow any pressure still left to be vented out the discharge hose; wait for that to stop. 2. Then keep turning the pressure cap slowly, and remove it. 5-15
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yellow
blue
5-15
1.
You can remove the coolant surge tank pressure cap
when the cooling system, including the coolant surge
tank pressure cap and upper radiator hose, is no
longer hot. Turn the pressure cap slowly
counterclockwise (left) about two or two and
one
-
half turns and then stop. This will allow any
pressure still left to be vented out the discharge hose;
wait for that to stop.
2.
Then keep turning the pressure cap slowly, and
remove it.