He claims my radiator has a lot of corrosion towards the bottom and I saw it, seemed like it was true. Do i really need a new radiator??? He made it sound like it is one of the most important parts of our cars and highly recommended i change it. He quickly called up and found 2 prices, one 400$ and one 275$. What do you think...is it bad enough to get a new one?? I'd guess about 15%-25% off the bottom had some whiteish color to it (corrosion). Thanks!