2003 GMC Sonoma Owner's Manual - Page 301

2003 GMC Sonoma Manual

Page 301 highlights

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

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