![]() Remove the top off the surge tank/coolant fill bottle in engine compartment.Place a large drain bucket or pan under the radiator drain petcock on bottom of radiator, on passenger side of car.You will need to lift the front end up (put up on a ramp or car jacks).Make sure vehicle coolant is not hot before draining.DEXCOOL is known to jell up and do other strange damaging stuff to all your internal components (engine, heater core, radiator) if not changed on a regular scheduled maintenance.Ĭhevy Cobalt Radiator Coolant Drain Steps: Must be a 50/50 mixture of DEX-COOL and clean drinking water. Looking into my 2006 Cobalt Owner’s Manual it states that DEX-COOL is designed to remain in your Cobalt for five years or 150,000 miles (240,000 km) or whichever occurs first. The cobalt uses ONLY DEX-COOL extended life radiator coolant and cannot be mixed with the regular green anti-freeze radiator coolant, as will form an acid that is very damaging to your cooling system. Make sure you have a big bucket to catch the coolant in or you will be making a huge mess, also have some rags on hand to wipe up any mess. Be careful the drain valve is only plastic. You may have to use a pair of pliers to turn the valve, as may be to hard to turn by hand. ![]() ![]() To open it, turn it counterclockwise 1-2 full turns to start draining, or keep turning to remove the drain valve completely. If you turn the petcock and open the valve, the radiator coolant will drain out of the drain hole on the bottom passenger side of the radiator. The radiator coolant drain petcock is located on the bottom corner of the radiator on the passenger side of the vehicle. How to change the radiator coolant on a Chevrolet Cobalt is not your normal procedure as done on older vehicles, so follow correct procedure.
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