How important is it to have your transmission and radiator flushed?

I have a 2000 Honda Accord and when I took it to Jiffy Lube the other day they said I'm overdue to have my transmission and radiator flushed. How soon should I have this done? Is it important? Also, a price estimate would be nice. I think Jiffy Lube wants $150 for each.

That's a little steep, make no mistake. But your car is 14 years old. Getting both done would be great preventive maintenance, but completely necessary? I would dispute that. You should get both done sometime in the next few years, but $150 a pop is idiotic. I have seen radiator flushes for $59 at reputable shops. $79 is average for those who want your business. $150 is too much.