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Achieva Oldsmobile 1994 Owner's Manual page 162

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Problims on the Road
I60
I
NOTICE:
I
In cold weather, water can freeze
and crack the engine, radiator,
heater core and other parts. So use
the recommended coolant.
I.
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 about one-
quarter turn to the left and then stop.
If you hear a hiss, wait for that to
stop. A hiss means there is still some
pressure left.
2.
Then keep turning the pressure cap
slowly, and remove it.
3.
Once the pressure cap is off, look
inside the surge tank opening and
look for a small cylinder at the base
of the opening. This should be
covered with coolant. If the cylinder
is uncovered, the coolant in your
system is low.

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