GMC 2003 Sonoma Owner's Manual page 300

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2. Then keep turning the pressure cap, but now push
3. Fill the radiator with the proper DEX-COOL
down as you turn it. Remove the pressure cap.
coolant mixture, up to the base of the filler
neck. See Engine Coolant on page 5-27 for more
information about the proper coolant mixture.
5-38

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