My Bunk A/C not working at all no air

[Zyon555]

Hey rawze my 2015 bunk a/c stop working for some reason but the front a/c still works ok but sometimes it stop for a few sec than start working again , but the bunk a/c no longer work it don’t even blow , can you tell me what can be causing these malfunctions sir.

[Lonestar10]

check fuses in storage compartment. if nothing is blown it could be the resistor thats mounted in the air duct just after the fan if they still use the same setup in 2015 as they do in 2010.

[smorgan87]

The front ac is probably cutting off to defrost the back coil. U need to diagnose why that blowers not working. Best waynto diagnose that is with a multi meter. First check the fuses, then check that power is going to the blower, low speed will be only a few volts, high will be full system voltage (12-14). If ur not getting power to the blower check for 12v to the blower speed control resistor (i forget its proper name but its the box the blower is plugged into). If u have voltage to that but not from that then either the control on the wall is broke or the speed resistor is broke. Make sure u have voltge on both sides the sleeper blower fuse dont just look at it.

[Zyon555]

Ok awesome thank you guys I’ll check them out and let you know how it all went

[Waterloo]

My experience with the rear AC not blowing is a failed blower motor, they seem to fail every 18 months or so. I have only replaced the resistor once, preventative measure, it still worked and still does. And I always remove the blower motor and bench test to double check. Mine is very easy to get too in the side box, three screws and a plug and it is out.

If you need any AC parts, this is the best place I have found, and they ship very fast, they are in Atlanta.

https://truckerac.com

Here is the blower motor page, these are the identical motors the dealership sells, at sometimes half the price, or more. You can get the resistors here too...

https://truckerac.com/blower-resistor-in...64141.html

https://truckerac.com/international-navistar.html

DOUBLE CHECK YOUR PART NUMBERS

You also have an air filter back there, it sits in front of the blower motor on the air intake under the bunk. That needs to be replaced on a regular basis. It is the same size as the one in your fresh air intake on your front AC system under the hood. I like to replace every oil change, they get nasty pretty quick depending on where you run or if you smoke. If the bunk one has never been changed, that may have or could, burn up your blower motor. You would be surprised at how many guys do not know that filter is back there. The blower motor sucks it right in when it no longer filters and destroys the blower motor.

There are two sizes on the filters, a larger filter for ProStars from 2006 - 2010, yours will take the smaller filter, 2011 to present. Again, check your part numbers.

I believe this is the filter your truck uses, again, there are two of them, one in front, and one in back. Check your part numbers.

https://truckerac.com/caairfinaoe3.html