Engine overheating occurring at idling, or while driving, is your vehicle's way of signaling to you that you're having a problem with your cooling system, perhaps involving your GMC radiator. Your GMC radiator malfunctioning is an urgent situation, as its inability to perform its task will directly have an adverse effect on your engine. High temperatures underneath your hood are regulated and lowered by the GMC radiator and thermostat, unless they are in failure. There are two checks you can perform during an inspection of your cooling system that can help to reveal the true source of your overheating problem. First, with the engine cold to make sure that the radiator fluid isn't hot and dangerous, check the radiator hose of your GMC radiator for cracks, splits or kinking and leaks. If your radiator hose is intact, then check your thermostat for proper functioning. Sometimes, a thermostat's spring valve will get stuck in its closed or open position ' if it gets stuck in the closed position, the heat of your engine becomes trapped in the engine compartment area, causing it to overheat. If you find that the thermostat is functioning, then your GMC radiator may likely be the source of you engine overheating. If this is the case, you can browse our online catalog for your GMC model and year and locate the GMC radiator for your vehicle. Our catalog includes an encrypted online ordering site that will allow you to immediately place your GMC radiator order without hassle. We also have a toll-free number that will connect you to our helpful customer service team, and they will be happy to take to your GMC radiator order by phone. You can always expect expedient order processing when ordering with us and we always offer to provide free ground shipping for orders of $50 or more. Order your GMC radiator through us today and you just may keep your GMC engine from throwing in the towel tomorrow.