2005 Chevrolet Silverado - Fan not coming on. When I turn the heater/ac blower fan on, fan does not work. Prior to completely going out, fan would quit working intermittently. Is this a fuse problem? Any tips on diagnosis would be appreciated.

check and test motor under dash behind the glove box test resistor [fan speed ] and fan both connections are access able

The first thing i would check is the heater blower motor for power.If the blower motor has power then pull and wiggle on the blower motor resistors pigtail or connector but make sure the heater and fan motor and the ignition switch are turn on so you can here if the motor comes on. A lot of times these blower motor resistors get hot enough to melt the connector causing it to loose its connection.

If you have a lamp testing if you have positive and negative if the voltage that is problem of the blower motor

blower resistor.. located under the pass. side of the heater case ..

it sounds to me like if the fuses are good then the resistor is burned out for the blower motor. it is usualy mounted near the blower motor and aprox. $25-$50. hope this helps and it is a cheaper fix than replacing the fan first. the resistor is the weakest portion of the blower motor electrical circut.

Sounds like you have a bad blower resistor. Its usually part of the switch. It takes about an hour to fix and the part runs about $70.00.

Treed55508,

Try this solution. I have had the same issue three times. A Chevy tech told me that if it keeps doing it, to replace the blower motor, as it seems to be a chronic problem with the blower having to much resistance and thus burning out the resistors. I suspect that you probably had lost one speed first and then more. It has happened both ways with me, once the entire thing went out at once and then the other times it goes one speed at a time.

http://sparkysanswers.blogspot.com/2008/07/2005-chevrolet-silverado-blower-inop.html

your speed switch located in heater box usually one wire to it in passenger feet area above "TOES" usually you loose 1 or 2 speeds on fan but it is unplugged or completely cooked good luck!

replace the blower motor .,....

when it doesnt come on next time, put it on high and give it a hit with your hand and see if it comes on. or test it for power at blower with test lite