ISSUE Air going into selenoid but not coming out and fan does not stop spinning fast

Discussion in 'Freightliner Forum' started by Semidumper, Jun 1, 2021.

  1. Semidumper

    Semidumper Bobtail Member

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    Nov 8, 2019
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    Been dealing with this issue for few weeks now I changed the fan hub, ac switch, fan clutch, selenoid now I have the issue that the selenoid does not close/open the fan the fan keeps spinning fast.

    Air goes into the selenoid but does not come out to close the fan clutch any ideas ?
    When I put air through the hose the fan stops spinning fast
     
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  3. ibcalm19

    ibcalm19 Heavy Load Member

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    It would seem to me the problem is at the solenoid. Does your fan have a switch in the cab that control the fan? I would check the electrical lines going to the solenoid regardless it would seem you are not getting any current to control the solenoid (just my thought)
     
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  4. Rideandrepair

    Rideandrepair Road Train Member

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    That’s the first thing to check, might be a short somewhere. Depending on what Truck it is, could have a bad fan pressure switch. Maybe the s/c pressures too high. Too much Freon in the system. No telling. Need Truck info, maybe a real mechanic on here will know more. We put a manual switch on a friends Truck, to activate it, till he could get a fan pressure switch. His fan switch was completely missing for some reason, wouldn’t turn on at all. Before that he was unplugging, ( or plugging in, can’t remember) to activate the fan, while parked,
     
  5. bad-luck

    bad-luck Road Train Member

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    Sounds like the issue is at the solenoid. Could be the ac fan pressure switch. Did you have the ac on when this was happening?
     
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  6. Semidumper

    Semidumper Bobtail Member

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    Nov 8, 2019
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    I changed the switch brand new and same thing and no
     
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  7. bad-luck

    bad-luck Road Train Member

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    Only other thing that I can think of is, youhave a bad wire some where before the solenoid. Or an issue with the ecm. If you get a shop to hook up a computer, they can manually turn the fan on and off, that will help you diagnose the problem.
     
  8. Rideandrepair

    Rideandrepair Road Train Member

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    You didn’t mention the fan pressure switch. What year? Make? Engine? Fan? All We know is that it takes air to release the fan. Some work the opposite. Are the air lines hooked up correctly at the selinoid ? Some Trucks like mine for instance have a module in the fuse box that affects fan operation. Need to know Truck info.
     
  9. flood

    flood Road Train Member

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    On my truck the body computer controls the fan
     
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