APU fan not working

Discussion in 'Ask An Owner Operator' started by Phoenix Heavy Haul, Jun 27, 2022.

  1. Phoenix Heavy Haul

    Phoenix Heavy Haul Light Load Member

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    APU busted top radiator hose and dumped all my coolant in middle of ATL a week ago. Nevertheless ordered a new hose put it in and now it’s getting hot and shutting down.

    Turns out my APU cooling fan isn’t coming on. I unplugged it and straight wired it and fan works fine and unit ran as normal no shutoff etc.

    I haven’t checked fuse yet but I will in the morning. If that’s not it figured it be the temp sending unit for fan. It appears to be right below the thermostat on back of engine. Any suggestions or clarification as to where the temp sending unit is.

    It’s a Thermoking Evolution
     
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  3. shatteredsquare

    shatteredsquare Road Train Member

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    there's a fuse on control board that says PCF "primary cooling fan", the fan can easily pull more than the factory fuse rating on start up, (same for the *condenser* fan, the outside one), I've had a 20 amp fuse in place for PCF for ~3 years and it's been fine since then. i think the actual fan just finally died though cause PCF quit coming on and fuses are all still good. 15k hours is a decent lifespan, half of that was with zero protection from salt/sand/dust/snow/water without the cover. it would run fine up to about 90 degrees ambient before it would shut down for coolant temp, if you run it with the cover open the PCF isn't really necessary. but i think it baked the alternator cause now running the tripac takes more juice than it creates until the truck low voltage trips, time to throw some $$$$$$ at this beesh
     
    Last edited: Jun 28, 2022
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  4. shatteredsquare

    shatteredsquare Road Train Member

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    [​IMG]
     
    MOBee and Phoenix Heavy Haul Thank this.
  5. Phoenix Heavy Haul

    Phoenix Heavy Haul Light Load Member

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    Thanks I checked all fuses this morning well ones that said anything about fan at least. I got 9100 hrs on it and it’s starting to need a lot TLC. I wired up a fused cigarette lighter plug for fan for these next few nights and it seems to be holding. Ima order the fan sensor and see what happens
     
  6. Phoenix Heavy Haul

    Phoenix Heavy Haul Light Load Member

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    Perfect thanks for the picture. I was pretty sure that was it but figured it couldn’t hurt to ask someone on here!
     
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