2001 Peterbilt 379 bunk blower problems

Check fuses.

Get to the air ducts from the blower to your vents. Take a look see about those dust bunnies that grow and clog everything.

Check fuses again.

Have a shop work on that rig. I would not go anywhere without being completely happy that you can get heat or air condioning from those blowers.

 

The cab is probably the blower resistor. The sleeper,do you have the front switch for the sleeper on?

 

Pretty sure there is a resistor that controls motor speed. If that is not it I would be thinking blower motor. As far as the bunk is concerned. Get a simple test light at Harbor Freight and check to see if you have power back there. There should be a fuse panel under the mattress. It does not hurt to pull the fuses 1 at a time to improve the contact. They do get funky over time. Would not hurt to spray penetrating oil on the contacts as you do this. It is a pretty basic job and I would not be giving up $100+/hr. to the dealer to do what you describe. No time like the present to start learning.

 

Use a test light to ck and see if you have power in and out of the dash switch that controls the bunk.

 

I know on a 70" bunk when you pick up the bed they to the right. Can not remember on the 60". Pull the control panel in the sleeper and see if you have power there. Could be the light bulbs are burned out. Is this something that just happened? Has it been working?

 

Start with switch on the dash. If you have power in and power out move on to the sleeper. Hope you do not have as much stuff under there as I do. I could be wrong, but I am pretty sure your sleeper has a separate fuse panel.