No heat when running, only when climbing a hill or stationary - KW T2000

Discussion in 'Trucks [ Eighteen Wheelers ]' started by DallasTrucker, Nov 14, 2013.

  1. DallasTrucker

    DallasTrucker Bobtail Member

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    Oct 2, 2013
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    The cold season is back and I'm facing the same issue as last winter. The air blows warm when stopped or when climbing a hill, but is pretty cold when running normally. I have a 2006 KW T2000 CAT C15 Acert. Any ideas what could be wrong?
     
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  3. PurplePete

    PurplePete Light Load Member

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    Nov 15, 2011
    Tyler, Mn
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    Make sure heater hose valves are all open.
     
  4. Heavyd

    Heavyd Road Train Member

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    The engine runs hotter when under heavy load, but cool under normal load, sounds like you have thermostat that is sticking open.
     
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  5. DallasTrucker

    DallasTrucker Bobtail Member

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    Oct 2, 2013
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    Thanks guys. Forgive my ignorance, how do I check/rule out the heater hose valves and thermostat?
     
  6. Heavyd

    Heavyd Road Train Member

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    Most trucks have some sort of valve on the heater hose lines between the engine and cab to shut off coolant flow to heater core inside the cab. The valves are normally either simple ball/lever valves or actual taps. With ball or lever type, when the handle is in-line with the hose it is open. Taps are just like your normal taps at home, turn to the left to open. The thermostat can't really be checked unless you remove it, but you can tell how it is working by how the coolant temp builds up. With the engine cold, start and run it for a few minutes, and then set it at about 1500 rpm and watch the temps increase. If it takes a really long time to get the temps up and they really do not get past 150 or so I would say it is stuck open. Normally the thermostat is closed to block coolant flow through the rad unit it is about 190 degrees. If it is working normally, you should see the temp gradually increase to about 180-190, then sharply drop 10 or so degrees as the thermostat opens and colder coolant from the rad is now pumping through the engine. If the thermostat is partially stuck open, as the engine is increasing in temp, so is the rad. You can feel the upper and lower rad hoses with your hand when the engine is around 140 or so and if the hoses are warm this means coolant is cycling through the rad when it shouldn't be.
     
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  7. DallasTrucker

    DallasTrucker Bobtail Member

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    Oct 2, 2013
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    Thanks Heavyd for the detailed explanation. I'll test that out.
     
  8. PurplePete

    PurplePete Light Load Member

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    Nov 15, 2011
    Tyler, Mn
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    The radiator needs to be full for the heater to work, might want to top it off.
     
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  9. e500gvr

    e500gvr Light Load Member

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    Aug 21, 2006
    Bloomington,MN
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    You have a by pass issue that a check valve will fix in the shunt line. Any Cat Dealer can fix this.
     
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  10. magoo68

    magoo68 Road Train Member

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    st malo mb canada
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    also check heater door to see if its open that would be my guess it will still provide a bit of heat with thermostat open heater door or valve partially closed are most likely culprits
     
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  11. TOSKABG

    TOSKABG Light Load Member

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    Mar 4, 2013
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    Your termostat is open...
     
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