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Why are they not allowed to go deeper? First I have heard of that from T/A with them being a Freightliner ServiceLink company...
Did they check the fuse for power that is under the cover for the dash, the small tiny fuse? If you look under the dash, there is a set of fuses that will be all the way towards the bottom, or closest to you and to the left. One should be a 10 AMP mini fuse. See if it is blown. Check the wires there as well. It is best to see if there is power on each pin. The fuse is not marked, but it is for the blower fan only. If there is power on that fuse, the blower fan is bad. If there is no power on the fuse, the issue is towards the controller. All that fuse does is power the blower motor, nothing else. Power goes from dash controls to fuse, then straight to red wire on blower motor. It is an between fuse that a lot of techs or mechanics know of when they are newer and haven't worked on them long. It is unmarked.
It is not on the main fuse board. It is not attached to it. Best way to describe it is lift the cover, the look on the edge of the opening closest to your chest. Follow that to the left (driver side) and you will see 2 or 3 fuses off to the side, It is just at the curve of the opening for the lid. That is where the fuse is.
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