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Doesn't it work in any speed ? Could have Blower Motor Control Processor if yours has automatic HVAC .
Or if manual it has blower motor resistor . Both are located under passenger side dash . Remove insulator panel under the dash if it has one !
ORO How to replace blower motor resistor in Chevrolet Silverado
I doubt its a relay. The high blower relay only comes into play on the high setting. You have a 40amp fuse for the blower relay, then a 30amp fuse for the other speeds. The 30amp fuse powers the fan switch, when you turn it to high it activates the high speed relay. I would check for power at the blower motor on all speeds.
There is a good chance that the wire harness has burnt out or the blower speed regulator. The other place that can cause this is a the blower switch it self has burnt out also due to the high current drawn by the blower.
Start with inspecting the switch first and then work your way to the blower resistor and harness. If the resistor has gone bad, replace the harness also. Oh and my bad and check the fuse and relay to your HAVC system.
Thank you for using fixya and Auto Zone should have the parts needs to repair your blower issues with the instructions to get the job done with common tools.
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.
Check the relais module located inside under the rh side of the heather box you can see the connector most of them need to be replaced as they burn out you may need to replace the blower motor as well,high amp draw caused by faulty bearings will overload the blower motor controller
Either the switch, relay or blower resistor has failed. I would check resistor and relay first. The resistor is a flat usually brown item attached by two screws to the blower box, usually fairly close to the blower fan. the relay is usually just upstream from there. Unless the switch feels sloppy, it's probably OK. If you can't locate these items, get a manual. It will help you with this and lots of other stuff!! Good Luck!!
there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate