Chevrolet 2009 HHR Owner's Manual page 309

If no coolant is visible in the coolant recovery tank, add
coolant at the pressure cap as follows:
Turn the pressure cap slowly counterclockwise.
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left to be vented.
2. Then keep turning the pressure cap and remove it.
3. Add the proper DEX-COOL
the coolant fill port, up to the base of the port.
See Engine Coolant on page 5-27 Engine Coolant
for more information about the proper coolant
mixture.
4. Rinse or wipe any spilled coolant from the engine
and the compartment.
1. Remove the pressure
cap when the cooling
system, including
the pressure cap and
upper radiator hose, is
no longer hot.
®
coolant mixture to
5. Then fill the coolant recovery tank to the
COLD FILL (A) line.
6. Put the cap back on the coolant recovery tank, but
leave the pressure cap off.
7. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
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