2004 Freightliner blower fan issue. HELP!!

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Allaby, Jun 2, 2013.

  1. razor1983

    razor1983 Medium Load Member

    Jan 17, 2011
    Those unmarked fuses in the relay slot were the issue with the cabin fan. However my problem with the AC still persists. The AC clutch works intermittently, usually when I just start the truck it works then stops after a couple of minutes or less. It is some kind of a power issue, when I hardwire the compressor directly to the alternator the clutch works fine, and the ac blows cold air into the cabin. I rechecked all the fuses and relays, all of them are good and I filled up the system with freon.
    This all started after I had to replace the leaking ac hose that goes from the compressor to the condenser. Also the dash trows up an error code now: 146S010 12

    Next step maybe replacing the blower resistor, even tho the fan works good on all speeds. Im not sure what controls the AC compressor, are there any sensors or thermostats? Which could be burnt out and are getting a wrong reading causing the compressor to shut off? Or a valve sticking?
    Any other suggestions would be appreciated!
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  3. fastsix62

    fastsix62 Light Load Member

    Feb 4, 2011
    fort worth, tx
    my plug to the fan was in the process of melting creating the problem you are describing as well.
  4. wcurtin1962

    wcurtin1962 Bobtail Member

    Oct 22, 2010
    Columbus, Ohio
    The blower motor has a built in speed regulator that must receive a signal from the heater control panel or it won't run. Most likely it's your harness between the control panel, the HVAC box and the blower. Specifically the blower plug, which you can't get separately. After I had fully replaced two harnesses, I gave up and now cut the plug end off the new ones and butt connect them to the old one VS having to tear down the dash every time. They last me eighteen months on the average.
  5. Boparai

    Boparai Bobtail Member

    Sep 3, 2018
    Hi can anyone help plz I have 2005 century and I have problem with ac clutch when I restart my truck it works for like 5 second then stops now I bypass it works fine I can’t find the problem
  6. Rideandrepair

    Rideandrepair Road Train Member

    Aug 8, 2015
    Sounds like low pressure switch located on top of air drier or maybe the wire to or from it that goes to compressor. Worth checking out
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