Chevrolet 2010 Colorado Owner's Manual page 311

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1. Remove the radiator pressure cap when the

cooling system, including the upper radiator hose,

is no longer hot. Turn the pressure cap slowly

counterclockwise about one full turn.

If you hear a hiss, wait for that to stop. A hiss

means there is still some pressure left.

2. Keep turning the cap to remove it.

3. Fill the radiator with the proper DEX COOL

coolant mixture, up to the base of the filler neck.

See Engine Coolant on page 6 28 for more

information about the proper coolant mixture.

4. Fill the coolant recovery tank to the

FULL COLD mark.

5. Reinstall the cap on the coolant recovery tank, but

leave the radiator pressure cap off.

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