fuse box
The owners manual would have that information.
when my car did this it was a blown fuse
should be in underhood fuse box!
Check the blower fuse located in the hood. It's a 40 amp fuse. Marked blower on the map
I bought a used 2003 avalanche and the soeakers have no sound. Radio works and has power but no sound. They seem to be connected (speakers) so is there a fuse maybe
There is a fuse for the blower motor on the fuse panel, I do not know of a relay.
30 amps.
If you have no speeds at all, including high speed and you have power at the fuse and the fuse is good, I would suspect the heater blower speed switch and or the electrical plug to the switch is cooked. If you have high speed only and the rest are dead, I would suspect the blower motor speed resistor.
The fusebox which controls the blower motor is under the hood up by the firewall.
Blower motor NG. Blower motor resister NG. Blower motor fuse NG. Blower motor switch NG.
It's the fuse for the blower motor in your dash (air vents)
The 1990 Chevy Caprice number 13 fuse is associated with the heater blower motors. The number 13 fuse will be in the second column, third from the top.