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As a tech who worked for a fleet which operated the T660 as its mainstay until recently (when they fell out of favor for the T680), I'll guide you right through this.
On the right hand (passenger) side of the vehicle, under the hood, and against the firewall, you'll see the HVAC compartment. On that compartment, you'll see a plate which is held in with four bolts... the top two are recessed further back than the bottom two. You'll remove those with a 10mm socket.
Once you've done that, CAREFULLY remove that plate - the blower motor is attached to it, and the wires are attached to the blower motor. The wires are attached with simple slide-in fittings, so they'll be easy to detach - just gently pull them apart.
Once you've done that, you pull the whole assembly out.
Remove the fan wheels by gently pressing them out... they do break easily, mind you, and if you don't feel like replacing them, you want to treat them with the kid gloves. Be mindful also that there are arrows on each one showing the direction its intended to spin... you want to reinstall them the same way on the new blower motor.
There's a metal clamp holding the blower motor to the plate... I don't remember off the top of my head what size socket and wrench you'll need for it, but it's a bolt with a nut and washer to hold the clamp shut... maybe it's 10mm? I remember how to do these, but it's been a while, so I don't remember offhand exactly what size sockets are needed, but I'm fairly certain they're all metric.
The last bolt you need to remove will be a much smaller one, and it's what attaches the blower motor wiring harness to the assembly.
Installation is the opposite of reverse, just bear in mind that you'll probably have to fidget a little with that plate when putting it back in order to get the bolt holes lines back up properly.
You are free to direct any questions arising directly from this answer to the email address listed on my bio page, but please post any questions not related to this answer as community questions - if you post them under the "Cars and Vehicles" or (preferably) "Commercial Vehicles" categories, you can be assured they will be seen and replied to, especially pertaining to the T660, whether with the Cummins ISX or PACCAR MX engine.
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