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Coolant tank for 2002 grand prix3/1/2024 ![]() ![]() ![]() My question is which coolant did my car come with? If it did come with green, should I go back to green after putting in the red? I am gonna try calling a few parts departments at Pontiac dealerships to find out. Both Prestone green and red meet this specification. All it said was to use a coolant that met GM Specification 1825-M. I was smart enough to look through the whole owners manual for the car and it didn't say anything about DEX-COOL, but it didn't say anything about just plain green coolant either. I didn't know what antifreeze to use so I put in about 2 jugs of Prestone Extended Life 5/150 Antifreeze (Red DEX-COOL). I then back flushed the entire system again for 30 minutes, took out the overflow tank and cleaned it, and replaced the thermostat. I then put in a bottle of Prestone Super Radiator Cleaner and ran it with just water for 5 hours of on and off driving. I checked the engine coolant and saw that it was BROWN! I decided to get a Prestone Back Flush Kit and back flushed the entire cooling system for 30 minutes. ![]() Repeat the procedure if necessary, until the fluid is nearly colorless.I bought this car on and am very impressed with it.Follow the drain and fill procedure using only clean, drinkable water.Install the coolant recovery reservoir.Clean and flush the coolant recovery reservoir with clean, drinkable water.When the cooling system becomes contaminated, the cooling system should be flushed thoroughly to remove the contaminants before the engine is seriously damaged. The surfactant and soap does not amount to much and there is water in your fluid already. Washer fluid is basically 95% water, 4% alcohol. Disconnect the tank, drain it and put fresh coolant in it. This is if you haven’t started the engine and only filled the reservoir. You may be able to drain or suck out the the contaminated coolant. It is not safe to drive the vehicle this way. Is it safe to drive and is it a big deal? I put a gallon in. I put windshield washer fluid in my coolant tank. ![]()
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