Flo first arrived in Radiator Springs as a touring Motorama girl. She was headed west with a transport of models when her chaperone blew her transmission just outside of town. Flo and the other Motorama girls spent an unforgettable weekend in Radiator Springs; new tires from Luigi, souvenirs from Lizzie, and a new paint job from Ramone. But when it came time to paint Flo, Ramone threw down his airbrush. Not because he was too good to paint her, but because she was too good to paint. The next day when the girls left, Flo stayed. She and Ramone have been together ever since."
Flo returns in Cars 2. Her role isn't that big though. She greets Lightning McQueen when he comes back to Radiator Springs. She also sees him off at the airport when he leaves. When McQueen calls her and the rest of the Radiator Springs citizens she comes to London. She also helps fights the lemons by hurting Vladimir Trunkov's eyes using her bright headlights. Back in Radiator Springs, she notes the big dent that Holley Shiftwell has in her rear fender and offers her husband's services to sort it out which Holley kindly declines, stating that the dent is "Too valuable." At the end, she and Sally admire Francesco Bernoulli's open wheels.