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A/C Question

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Boardhauler, Jun 23, 2019.

  1. Jun 23, 2019 #1
    Boardhauler

    Boardhauler Road Train Member

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    2017 389 Peterbilt. The air was was not blowing very cool, so I asked our alcohol pickled, psychopath mechanic to look at it. He added refrigerant, now it's cold, but the engine fan cycles all the time, even going down the road with the coolant temp down around 180 or 190.

    He says this is not that abnormal, I'm causing it by setting the A/C temp too cold. I think it is abnormal and is a contributing factor to my fuel mileage dropping from 6 to 5. I think there should be enough air going through the condenser @ 60 MPH for it to do its job without the fan coming on..

    Any thoughts?
     
    Boardhauler, Jun 23, 2019
    Boardhauler, Jun 23, 2019
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  3. Jun 23, 2019 #2
    Bean Jr.

    Bean Jr. Road Train Member

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    Going down the road under normal operating temperatures on a hood, the fan should never come on. In traffic, yes, idling, yes, and even then the fan shouldn't be on all the time.

    There is a triple switch at the expansion valve. Mine was the same way. Fan stayed on. Replaced it, fan is off.
     
    Bean Jr., Jun 23, 2019
    Bean Jr., Jun 23, 2019
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  4. Jun 23, 2019 #3
    Hulld

    Hulld Road Train Member

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    Normally the fan should only cycle on really hot days at slow speeds such as rolling thru a toll plaza.
    Usually on a hot day you hear the fan roar as you up shift thru the gears and then finally turn off as you near high gear.
    The only time I have seen your situation is a hot day and a system over filled with to much refrigerant.
    To much refrigerant causes excess pressure in the condenser and the high pressure switch triggers the fan to come on excessively.
     
    Hulld, Jun 23, 2019
    Hulld, Jun 23, 2019
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  5. Jun 23, 2019 #4
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    If it’s hot outside, prolly will cycle more than usual. Mine did . And it does get annoying. I just turned the AC off till the fan kick off them turned it back on.
     
    Diesel Dave, Jun 23, 2019
    Diesel Dave, Jun 23, 2019
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  7. Jun 23, 2019 #5
    swaan

    swaan Road Train Member

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    Too much refrigerant will cause this also.
     
    swaan, Jun 23, 2019
    swaan, Jun 23, 2019
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  8. Jun 23, 2019 #6
    Old Man

    Old Man Road Train Member

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    It causes high pressure switch to engage fan.
     
    Old Man, Jun 23, 2019
    Old Man, Jun 23, 2019
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  9. Jun 23, 2019 #7
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    That’s why I prefer to go by the eye glass on the dryer, bubbles gone.... it’s full.
     
    Diesel Dave, Jun 23, 2019
    Diesel Dave, Jun 23, 2019
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