I bought this car on 9/3/2003 and am very impressed with it. Really I am
not complaining. It is a great car. I love the 210 hp 3.4 L DOHC engine.
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. 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 then back flushed
the entire system again for 30 minutes, took out the overflow tank and
cleaned it, and replaced the thermostat.
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 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.
All it said was to use a coolant that met GM Specification 1825-M. Both
Prestone green and red meet this specification.
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. If it
is green, it won't bug me much to back flush the system again for 30
minutes, run Prestone Super Radiator Cleaner through it again for 5 hours,
back flush again for 30 minutes, replace thermostat, clean out overflow
tank, and fill up with Prestone green.
Thanks In Advance,