I think mine went south about 55,000. I had a flush done and within 1,000 miles the pump was toast. Don't know if the flush had anything to do with it. I have had quite a few odd ball things to fix on mine. Chased gremlins for better than a year. I hope the last ones gone.
I had to go find the original bill for the mileage count, date of service, plus costs.
It looks like I had this done back in Oct. 2015, with 28,289 on the odo, Cost for the
flush and refill was $ 124.95. Given the notation down below here, I have changed out
the fluid before the 30K, but way past the 24 months limit/waypoint for this service. Car born on date
was Oct. 2007 IIRC. 8 yrs. from born date, to first flush/fill. Way past 5 years for cooling flush.
I am not sure what the previous owner did, if anything to the radiator cooling system.
That's why I did it then, given the years since the factory installed fluid, and no previous
knowledge if the first owner had this done, more than likely not, without a service record pull
by the dealer, from the VIN #.
So over the course of the 4 years since this was done, the mileage difference of some
16,211 miles, with no problems. If GM recommendation that the Dex-Cool fluid should be changed out
after 5 years of use, I should be up for another change next Oct. Some note here, on pg. 5-29 of the
owners manual, Notice: In addition, the engine coolant could... require changing sooner at 30K or 24 months,
whichever comes first. In the back of the manual, pg. 6-6 under Additional Required Services, it is recommended
Engine Coolant system service, or every 5 years @150K. with a note, to clean radiator, condenser, pressure cap, and filler neck.
I have cleaned my radiator & IC too, the outside on both sides. Some grime and slime, but did the dealer clean the inside of
the radiator during this flush/refill? That I am not sure of. Condenser is another thing that I'm not sure of.
Given the cost of this service, the miles I have done so far, with the possibility of another fluid change with in
the next year, against the cost of the WP replacement, think I will stay on schedule here with what is recommended
by the factory. Sure the cost of this service, is part of the Big picture for our cars maintenance and with me
doing this service again next Oct. that's $250. in maintenance over the 6 yrs, just for the radiator/cooling system,
during my ownership to protect the cooling system on our model. Given the cost of the $900. - $1100. WP replacement,
I think it is pretty good bang for buck here for any owner. Yes the WP could go out at any time. Each car is different,
they look the same, they use the same parts, use the same recommended service, but... Murphy's Law comes into to
play for any owner.