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These trucks have what is called a "blower motor resistor". It is used to lower the voltage reaching the heater fan which results in a slower speed. It could also be a bad heater fan switch, but is likely the resistors... see it all the time.
Go to advanceautoparts.com, put your vehicle in there and do a search for "blower resistor". You'll see a picture of the part.
The switch, high blower speed relay or the wire harness at the blower motor has gone bad. The
highest setting 5 has no resistor, so the blower runs on high but the
high current flow ends up burning up the switch's contact on that
setting or the relay and may be the resistor wire harness at the blower motor has gone bad.
Common would be the switch it self, if the switch is good. Then it's
going to be the blower relay or wire leads at the speed resistor by the blower motor
under the glove box by the passenger leg compartment. Keep me posted,
be glad to help you get your Silverado running 100% again soon.
remove the passenger side lower insulator panel. behind the panel you wil find the blower motor housing. next to the blower motor housing there will be a wiring connector with 6 to 8 wires going in to it. the connector will be held secure with 2 screws. remove the connector and remove the screws -- this is your resistor. reverse the process to re-install.