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  1. #1
    Road Train Member rollin coal's Avatar
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    a/c blower motor, a/c problems...

    Where is the blower motor for the cab vents this is an '03 T600? Is it easy to change out? Are replacements expensive? I'm not even sure the blower motor is my problem. My a/c is aggravating. The expansion valves freeze up. Everything's been replaced a blown compressor this past winter, new drier, new expansion valves. I can turn the a/c on and the blower will quit working after about 30 seconds. Turn it off then turn the blower off,,,, a few minutes later turn all on and try it again , same thing. After doing that for about 50 miles down the road a few dozen times finally it will continue to blow cold air for a long time and I have good a/c until it freezes up and I have to turn everything off and thaw it again for a few minutes then I got good a/c for another good while... Another wierd thing is I can turn the blower fan on low or high and it will always freeze up. The only way I can ever get or even keep a/c once I've got it going is to set the blower on medium and I always have to have the sleeper a/c on as well.. I hope somebody can give me some ideas things to check here.. I'm thinking maybe do a full evac then recharge after replacing the drier... and hope that fixes it then maybe try replacing the blower motor if not.. I really don't know what to do I am thinking it is more than the blower motor but my fan does seem kind of weak... It sucks having a flaky a/c in the deep south during summer and sucks even more just throwing money at the problem...


  2. #2
    Heavy Load Member RW.'s Avatar
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    Jan 2009
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    west central IL
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    You get to the blower motor for the cab by removing the panel on the passenger side firewall. Have to take off the air intake tube, then its the panel behind it. Not terribly difficult to get to, probably the biggest challenge will be rusty screws. The motor itself isn't too expensive, has a fan mounted on each end of its shaft, make sure you mark them before or immediately after taking them off so you don't put them on backwards later. Won't get much air if they're backwards. I don't know about your other a/c problems, but I can offer one suggestion if you open it up to change the motor- use air and water to blow out and then flush out your a/c evaporator and heater core. If its never been done, and your truck is an '03, it probably needs it. May not solve the problem, but it could help and it doesn't take long to do. Good luck.

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  4. #3
    Light Load Member captw900's Avatar
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    Aug 2011
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    buffalo,Ny
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    Oh man I just resided a 01 freight that I suffered in part for that problem. My air dryer imploded caused black death hope that didn't happen to your system I should have changed out the hole thing when it happened in stead I threw good money at bad 3 compressors a year the blak stuff in the dryer went thru every thing. If your fan can't blow through the evaporator due to dirt,hair it may cause pressure to go up and freeze things up I hope its just that. And not the black Seth good luck

  5. #4
    The Legend CondoCruiser's Avatar
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    Apr 2010
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    Tennessee
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    Yep, captw900 got it right. If the expansion valve is freezing, there's dirt or debris in the system and is possibly the dryer at fault. Have someone hook up the gauges and an abnormal high reading on the high pressure side will show the expansion valve is clogged.

  6. #5
    Bobtail Member
    Member Since
    Aug 2011
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    Ponca City Oklahoma
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    Check the water drain for the evaporator. They can get plugged up with all kinds of stuff from twigs to mud dabbers. If the water can't drain out from there then it freezes up real fast. And no air will come out of the vent's. And on all KW's the blend air door may be hung up. Hope this helps Bill

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