Chevrolet 2006 HHR Owner's Manual page 288

CAUTION:
{
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol
and it will burn if the engine parts are hot
enough. Do not spill coolant on a hot engine.
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 5-20 for more
information about the proper coolant mixture.
5-28
1. You can remove the
pressure cap when
the cooling system,
including the pressure
cap and upper
radiator hose, is no
longer hot. Turn
the pressure cap slowly
counterclockwise.
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coolant mixture to
4. Rinse or wipe any spilled coolant from the engine
and the compartment.
5. Then fill the coolant recovery tank to the COLD
FILL 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.
8. By this time, the coolant level inside the radiator
filler port may be lower. If the level is lower, add
more of the proper DEX-COOL
through the fill port until the level reaches the
base of the fill port.
9. Then replace the pressure cap. At any time during
this procedure, if coolant begins to flow out of the
fill port, reinstall the pressure cap. Be sure the
pressure cap is hand-tight and fully seated.
10. When the engine has cooled, check the coolant in
the coolant recovery tank. The level in the coolant
recovery tank should be at the COLD FILL line
when the engine is cold.
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coolant mixture