Where is the flasher fuse relay located on a 2003 Chevy Express?

The flasher relay for a 2003 Chevy Express 1500/2500/3500 isn't typically a separate fuse/relay, but instead is integrated into a larger module, usually the Body Control Module (BCM). There isn't a standalone flasher relay like in older vehicles. Therefore, you won't find a "flasher fuse relay" in the traditional sense.

If you're having turn signal problems, the issue is more likely to be within the BCM itself, a wiring fault, or a faulty turn signal switch. You would need to diagnose the problem using a multimeter or a scan tool to pinpoint the exact cause. A mechanic or experienced auto electrician would be best equipped to handle this.