FLD120 low coolant temperature

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JoeyJunk, Jan 22, 2022.

  1. JoeyJunk

    JoeyJunk Road Train Member

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    Series 60 12.7 on its last leg. Oil in coolant. Couldn’t get above 130-140 while driving. At idle it would be 85-100. Obviously low heat and no heat with those temps. Changes thermostats today and idled for three hours. Temps at 160 and nice heat. Drove 28 miles to shipper and at high idle already down to 119.

    I’m by no means a mechanic or understanding of most things. What am I missing? Is there too much oil in coolant for thermostats to work? Not sure if that even makes sense. Anything else I can so or fix to make this last two more weeks when new engine comes in? Oil cooler maybe?
     
    Last edited: Jan 22, 2022
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  3. JoeyJunk

    JoeyJunk Road Train Member

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    Engine uses 2-3 gallons of coolant a week. At least 2 gallons of oil. Fuel mileage is garbage as well. Still making lots of money but tired of wasting fluids and money.
     
  4. baha

    baha Road Train Member

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    Just keep it full of oil and coolant so you don't have to worry about the tow bill to get it home?
     
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  5. goga

    goga Medium Load Member

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    I'd do an inframe ASAP and go make money again being happy with the rig. At this point rates allow to do this and recover in a month at most.
     
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  6. sbaumann14

    sbaumann14 Road Train Member

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    Well you’ll be doing an in frame at least. The coolant in the radiator might mean you’ll be doing that as well.
     
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  7. 062

    062 Road Train Member

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    Water temp is going to depend on a few things.
    Ambient temp and wind speed/direction
    What rpm is your high idle?
    I’ve idled at 1200 rpm in subzero temps with 10-15mph winds.
     
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  8. JoeyJunk

    JoeyJunk Road Train Member

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    My new engine is being built. I’m just trying to have heat for another week or two till the engine is done.

    My temps are fine going down the road and I have heat. idle between 1100-1400 RPM the temp was between 114-119 last night with outdoor temp of 20-25.

    The thermostat replacement fixed half of the problem as I have heat and good water temp when going down the road. I just was looking for a solution to the idle temps so I can have heat while sitting/sleeping.
     
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  9. 062

    062 Road Train Member

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    Go dumpster diving and make a winter front.
     
  10. JoeyJunk

    JoeyJunk Road Train Member

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    Already did that lol. Maybe Its not adequate??
     
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  11. Rideandrepair

    Rideandrepair Road Train Member

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    Is the fan engaged constantly? Oil’s probably from the cooler. Where’s the coolant going? Out the overflow? Or out the exaust? Bad head causing all the problems most likely. Try to keep the coolant topped off. 2-3 gallons a week is a lot. It could blow the head gasket and hydro lock at any time. I’d keep the radiator cap loose. Keeping pressure down.
     
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