Where is the transmission dipstick located for a 2003 Chevy Malibu?

The 2003 Chevy Malibu does not have a transmission dipstick. Automatic transmissions in those vehicles check the transmission fluid level indirectly through a specific port using a scan tool. You cannot check the level with a dipstick. If you need to check the transmission fluid level or condition, you'll need to take it to a mechanic or a shop that can do this properly.