where is the cooling fan switch located on a 91 rs camaro 305 ingine

Fan relay located on driver side firewall.Hot wire off fuse and main voltage off battery.ECM grounds at set temp or when AC is in use should be green and white striped wire. Hope this helps.I have an 87Z28 350TPI and 90RS there not identical but very similar.The 90RS is just like above pulled ECM and rewired fan and all gauges worked dropped in 383 with nitros and edelbrock RPM package great car but I wouldn't do it agian.