Power Steering Pump problems of the 2007 Chevrolet Trailblazer

I had gone to a friends house and on the way home my power steering malfunctioned. I took the vehicle to a local auto repair shop and was told the power steering cooler had rusted through. I also had to replace this part on my 2003 Trailblazer not realizing there was a problem. If this part rusts out on different years of the same model there seems to be a problem. The vehicle became very hard to steer. I know for a fact that I and many other people have had problems with transmission lines gasoline lines and power steering lines. I had to replace the gasoline line and fuel pump on the 2003 , and just replaced transmission line on the 2007. I think there needs to be an engineering change on these vehicles. I also received a recall notice on the 2007 Trailblazer for the electric window switch. The notice said I would be notified when to bring my vehicle in. It has been several months since I received the notice and I am still waiting for notification. It cost me $350. 00 to have the power steering repaired. .