I have not replaced mine, but from being under there doing the filter kits, I would think its this way:
1) Lower the silencer cover (if so equipped) above the passenger footwell area. I dont recommend removing it completely...just take out the two screws above the pass footwell. The cover bends, so you can get at the fan.
2) You'll see the fan on the underside of the HVAC unit behind the glovebox area. Unplug it from the fan control module and remove the screws holding it in.
I do not know if a new motor comes with a squirrel cage or not. Install reverse of removal.
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!