We have a 2013 Prius Plugin. When the fan comes on (auto setting) it starts at its highest setting and produces an unusually loud noise. When the fan drops to a lower speed the noise stops. We took the car to a shop (not Toyota) who told us they at first thought debris in the fan motor but after closer inspection said the fan was beginning to fail. This shop had given us “questionable” info on other problems (tires, brakes, etc) so I think I’ve lost trust. They told me btw $400-$500 to replace because of labor taking the entire dash off. Are they lying again?