Tim,

I had the coolant flushed out about 2 years ago on my 2wd Van but when I took it in for service they told me the water to coolant ratio was too high and it need to be flushed again. It still runs cool with the temperature needle 2-3 ticks below the half way line. But since you said flushing every 2-3 years I'm guessing it's time but I'm not interested in paying $165 for a coolant flush....sheesh!!!