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View and download gmc 2003 sierra 1500 pickup owners manual online 2003 sierra 1500 pickup automobile pdf manual download also for 2003 sierra. Adding engine coolant also known as antifreeze to your 2003 gmc sierra 1500 is pretty easy engine coolant circulates through your engine to keep it cool in the summer but wont freeze in the winter make sure to check your engine when it is cold for an accurate reading the video above shows you where the coolant reservoir in your sierra . Gmc sierra 2003 engine coolant radiator by reach coolingr increase the life of your vehicles engine by keeping your cooling system in top condition replace your faulty engine cooling component with this highly efficient replacement