The radiator on your 1999 Chevy Suburban is part of the coolant system that keeps your engine from overheating. Over time, sediment and other deposits can build up inside it. This can be detrimental to your radiator's performance. You should flush the radiator on your Suburban at least once a year, according to the manufacturer. Doing this will only take you around 30 minutes and does not require any specialized tools.
Check to make sure your radiator is not hot. Never open your radiator when it is hot. Allow at least 30 minutes after driving your Suburban before trying to open the radiator.
Park your Suburban on a flat surface within reach of a garden hose.
Place your drain pan under your radiator and then remove your Suburban's drain plug with a wrench. The radiator will sit flush against the inside against the front grille when you open the hood. The drain plug sits on the immediate bottom of the radiator, on the driver's side on your Suburban. Allow all the old coolant to drain out into the pan.
Replace the drain plug and fill the radiator half-way full with water. Start your Suburban's engine and remove the drain plug again. Set the end of your garden hose into the top radiator fill hole and slide it down into your radiator about an inch. Turn the garden hose on. Allow the water from the garden hose to flush through the radiator for 15 minutes and then replace the drain plug again. Turn the garden hose off, grip its end and ease it out of the radiator hole.
Fill your Suburban's radiator with coolant and then replace the radiator lid.
