2005 GMC Envoy. Blower will not work all fuses have been checked.No heat or A/C, ANY THOUGHTS

Have u located the fuse as well as the relay? Bad switch?

Yes, that would be the first thing to check. If the fuse is OK, then possibly a short in the circuit. If a short is not found through multimeter testing, then your blower motor is probably toast.

I would check the resistor which is next to the blower and check for power on both fan and resister. Let see what you find.

Find & remove the fuse or relay

their is a blower motor relay in the fuse box under the hood more than likely your problem!

First thing to do is check the fuses. Check ac fuses and relays and auxilary relays. If okay you may have a bad blower motor or blower motor resistor

If this a manual HVAC system, the blower motor resistor pack is defective or the blower motor itself is bad.
If this is the Automatic digital HVAC, the blower motor control module is defective or the blower motor itself is bad.

It sound like to control panel switch. Can you get to the back of the control panel??? If so, bypass the switch, and connect the two wires with a jumpper wire to see if it start blowing????

More than likely this should just be your resistor. You have different sized coils on the back of your resistor for all the different fan speeds. if one of them burns out or breaks then that certain speed will not work.