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03’ 9900 clutch fan engages very frequently

Discussion in 'International Forum' started by Dadetrucking305, May 24, 2021.

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  1. May 24, 2021 #1
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Cibolo,Texas
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    The clutch fan on my truck engages frequently and I have counted 3-5 seconds in between intervals.What can be causing this?
     
    Dadetrucking305, May 24, 2021
    Dadetrucking305, May 24, 2021
    #1
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  3. May 24, 2021 #2
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    An '03 Columbia I was driving started doing that when I was running the a/c. Wan't getting enough air flow through the condenser. Had to evac the A/c, remove the condenser, take the hoses off the air cooler and separate it from the radiator. Then the mechanic blew it all out. Ended up with the floor covered 1/2" deep with crap that came out of there. Put it all back together, charged the a/c and no more problem.
    I had tried blow the whole thing out before, but because it had been so many years since it was really cleaned i just ended up packing the crap in there more.
     
    kemosabi49, May 24, 2021
    kemosabi49, May 24, 2021
    #2
    Dadetrucking305 Thanks this.
  4. Jun 30, 2021 #3
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Cibolo,Texas
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    Changed out the high pressure switch/sensor and it’s still doing it.
     
    Dadetrucking305, Jun 30, 2021
    Dadetrucking305, Jun 30, 2021
    #3
  5. Jun 30, 2021 #4
    ChuckMartel

    ChuckMartel Light Load Member

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    Jan 22, 2021
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    Is it kicking at a certain temp? Only when AC is on?
     
    ChuckMartel, Jun 30, 2021
    ChuckMartel, Jun 30, 2021
    #4
  7. Jun 30, 2021 #5
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Turn the a/c off. It's likely building head pressure, turning on the fan, head pressure comes down, fan goesoff
     
    Big Road Skateboard, Jun 30, 2021
    Big Road Skateboard, Jun 30, 2021
    #5
  8. Jul 7, 2021 #6
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Sep 15, 2011
    Cibolo,Texas
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    Hadn’t thought about the A/C but I just tested it and sure enough that’s what’s causing it to come on.So what could be wrong with the A/C?
     
    Dadetrucking305, Jul 7, 2021
    Dadetrucking305, Jul 7, 2021
    #6
  9. Jul 8, 2021 #7
    God prefers Diesels

    God prefers Diesels Road Train Member

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    It's supposed to do that. The condensor has to have air flow. So if you aren't moving, the fan has to come on when the pressure gets high enough to trip the switch. It will do the same thing if you're running the defroster.
     
    God prefers Diesels, Jul 8, 2021
    God prefers Diesels, Jul 8, 2021
    #7
    Dadetrucking305 Thanks this.
  10. Jul 8, 2021 #8
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Cibolo,Texas
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    It’s doing it while I’m driving.
     
    Dadetrucking305, Jul 8, 2021
    Dadetrucking305, Jul 8, 2021
    #8
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  11. Jul 8, 2021 #9
    God prefers Diesels

    God prefers Diesels Road Train Member

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    Oh hell, it shouldn't be doing that. Could be something as simple as being low on freon.

    @Rideandrepair is pretty good with A/C, as well as several others, but he's the one I remember going really in depth recently.
     
    God prefers Diesels, Jul 8, 2021
    God prefers Diesels, Jul 8, 2021
    #9
    Dadetrucking305 Thanks this.
  12. Jul 8, 2021 #10
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Sep 15, 2011
    Cibolo,Texas
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    I changed the high pressure switch/sensor and purchased Freon bottle and it showed that the truck was full.
     
    Dadetrucking305, Jul 8, 2021
    Dadetrucking305, Jul 8, 2021
    #10
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