Hey guys, I have a 04 Silverado, I was driving the other day with the heat on and fan speed set to 5. It stopped blowing. I could switch it to 1-4 on fan speed and it would work like normal. Now none of them work and it doesn’t blow at all. Any suggestions would be greatly appreciated. Thanks

 

Welcome from Florida. Check your blower motor resistor first.

 

Is '5' the highest setting? If so then the high speed relay has failed. On some vehicles that relay is part of the blow motor resistor assembly that oldchevy mentioned. Also, when these resistors assemblies go out, it's usually because the motor is failing and drawing too much current.