Maby Chevy never put one in the car. On some newer Cavaliers they tend to forget to put little things in like that cause they come off the assembly line so fast and, arn't inspected very good afterwords. Chevy may have never put a dipstick in it purposly, like my brothers truck ( '91 Ford Ranger ) doesent have a filler opening so, you have to stick a funnel in the dipstick tube to fill it. Being your car probably sensor for low tranny fluid, they probably figure, you add fluid when the light comes on. Heck you probably have a warning light for low windshield washer fluid.