The heater/ac blower recently quit working on my '97 Olds Bravada. If you turn the fan speed dial all the way up and then move it from highest setting to setting thats just lower than highest you can hear a clicking sound coming from top of dash, almost like it's below the speaker
Lift your hood and look on the left side of the firewall. You'll see a plastic drum shaped piece of plastic. It's located right there.
