'02 Duramax intermittent blower motor issue

[sh00ter]

Blower motor has been replaced, still only works intermittently and sometimes works if the truck goes over a hard bump in the road. Where would I look next to find the issue. I've seen a p/n for a blower motor resistor, but never found it on the truck.

 

[dlbleak]

Blower motor resistor is a different component. Mine went out and would only blow on high. Yours sounds more like a short but could be at the resistor

 

[Snattlerake]

Blower motor has been replaced, still only works intermittently and sometimes works if the truck goes over a hard bump in the road. Where would I look next to find the issue. I've seen a p/n for a blower motor resistor, but never found it on the truck.

Does this look about like yours?

 

[sklfco]

Sounds like a faulty connection in the circuit that intermittently makes contact when you hit a bump. First thing I would do would be to pull it into the shop and turn the motor on high. Then follow every bit of wiring associated with the circuit and give it the 10 pound pull test.
Common automotive wires and connectors in serviceable condition will withstand this force.
Faulty ones will identify themselves.
Pull it shake it wiggle it around, keep an ear out for that motor to spool up. Sometimes a helper is needed once you get out under the hood into the distribution boxes to alert you. Hopefully it’s something easy to spot like a passenger got her purse shoved up too far and knocked something free.
Good luck, chasing wires sux.........

 

[Snattlerake]

Sounds like a faulty connection in the circuit that intermittently makes contact when you hit a bump. First thing I would do would be to pull it into the shop and turn the motor on high. Then follow every bit of wiring associated with the circuit and give it the 10 pound pull test.
Common automotive wires and connectors in serviceable condition will withstand this force.
Faulty ones will identify themselves.
Pull it shake it wiggle it around, keep an ear out for that motor to spool up. Sometimes a helper is needed once you get out under the hood into the distribution boxes to alert you. Hopefully it’s something easy to spot like a passenger got her purse shoved up too far and knocked something free.
Good luck, chasing wires sux.........

I hated troubleshooting intermittent faults. You couldn't prove anything until you finally divided the circuit and conquered.

 

[918evo]

Check the blower motor plug. I have had to splice new connectors on a few chevy trucks.

 

[sh00ter]

Thanks to all, I figured it was a short as well which I agree is a real pain.

 

[Bocephus123]

Switch on dash been replaced?