Hi there I just picked a 2015 Smart fortwo. It has only 32K kms on it. When I start it up it has a high pitch for about 15 -20 secs. Is this normal? In the winter is it going to be a higher pitch for 3 minutes? Should I get a diagnostics on it? I know cars warm up but my Jeep doesn't have a high pitch. Thank you. PS....I may just be paranoid.