Not much heat output in the cab of my truck, what would cause this?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Russian Rabbit, Nov 10, 2018.

  1. Russian Rabbit

    Russian Rabbit Road Train Member

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    What would cause there to generally not be that much heat output to the cab?

    It was basically lukewarm at best. And, only when climbing long hills did the heat become anything resembling normal, but still not normal. At idle, really not good.

    i believe i had the valve open, it's a cummins (isx?) i know i should have taken a pic, but it's on the passenger side of the engine coming out of the passenger side of the engine out of that metal tube......

    The temp gauge, if it was working properly, only registered a little above 140.


    P.S. This isn't my usual truck; You may or may not know we are under work stoppage due to the possible strike, so i called up my weekend gig to see if there was any work available.
     
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  3. Goodysnap

    Goodysnap Road Train Member

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    If the engine is only reaching 140, tis your problem. Normal operating temp is 180-190. ISX thermostats hang open all the time. Rubber seal comes loose and lodges in the thermostat hanging it open and causes overcooling.
     
  4. kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    Probably 2 valves. One from engine to the heater and one going back. Both have to be open.
     
  5. mitmaks

    mitmaks Road Train Member

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    Sounds like thermostat
     
    stillwurkin Thanks this.
  6. Heavyd

    Heavyd Road Train Member

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    Poor coolant flow through the heater core, poor air flow over the heater core, or temp blend door problem.
     
    spsauerland Thanks this.
  7. LGarrison

    LGarrison Road Train Member

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    Check the level of your engine coolant if it runs low you won't have no heat
     
  8. Hulld

    Hulld Road Train Member

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    140 degree water temperature is definitely a thermostat stuck open issue.
    For a temporary fix
    put a little card board in front of the radiator and watch your temperature gauge read higher and your heat get better.
    Just don’t block it completely off.
    Use your temperature gauge as your guide to determine if you need more or less card board
     
    Russian Rabbit and stillwurkin Thank this.
  9. blairandgretchen

    blairandgretchen Road Train Member

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    Make sure one of those valves isn’t a cut off to the trans cooler if equipped.
     
    Russian Rabbit Thanks this.
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