Low coolant warning light and bell...

Discussion in 'Kenworth Forum' started by nomad3d, Apr 16, 2016.

  1. Cesaravila77

    Cesaravila77 Bobtail Member

    Nov 30, 2018
    I have a 2006 volvo tractor and dash shows low coolant and it shuts off.
    I replace the coolant level sensor and problem remains. I inspect the wiring to the connector and it does not show any signs of damage. Any suggestions as what to do next?
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    QUALITYTRUCK Road Train Member

    Jun 14, 2009
    Did you trace wiring all of the way to ECM?
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  5. HoneyBadger67

    HoneyBadger67 Road Train Member

    Dec 15, 2018
    Champaign, IL
    Prostar I used to drive for a company used to do that. It ran low on coolant once and, after filling, the idiot light never went off. A few taps with the handle of a screwdriver dislodged the air bubbles....
  6. DieselTech_Aus

    DieselTech_Aus Light Load Member

    Dec 20, 2017
    Is it 2 or 4 wire level sender?
  7. 98 star car

    98 star car Light Load Member

    Jul 25, 2015
    Avon, Indiana
    Having same issue now. 18 579. Replaced sensor was good for 3 days. Acted up yesterday. Replaced sensor again. 50 miles later coolant light on again. It was triggering the dpf filter gauge to read full as well. Unplug sensor that code goes away. Today nothing so far. Wiring looks ok until it disappears into loom with everything else top center of motor. Tank might be next because of magnet internally will get stuck. To be continued....
    D.Tibbitt and x1Heavy Thank this.
  8. x1Heavy

    x1Heavy Road Train Member

    Mar 5, 2016
    White County, Arkansas
    Dynamite that tractor. See if it rings on the way down. HA.
    GoBucks43228 Thanks this.
  9. Coldfire1968

    Coldfire1968 Bobtail Member

    Aug 29, 2020
    How do you remove the coolant sensor is it just the zip tie holding it on
  10. Lowboy456

    Lowboy456 Light Load Member

    Mar 14, 2017
    I'd do what kwill710 sugests.
    If it works with the 200k ohm resistor unplugged, leave it that way and watch the temp gauge from now on like the old timers did.
    My T800 doest have a low coolant sensor so I keep a close eye on at temp gauge all day long. You have that and your sence of smell. Just the other day I noticed 1st a hot coolant smell, then a few minutes later I noticed when the engine fan came on my temp wasnt dropping back to 185 like it should. Instead it kept climbing.

    So I pulled over and found a coolant line spraying a tiny stream.

    To keep from losing more coolant I loosened the hose clamp and pushed the hose farther on the nippel.
    I then cut 1/4 inch off the hose at a time and pushing the hose
    on farther each time until I got the leak cut out of the hose while never taking it completely off.

    I put 4 gallons of water that I keep with me at all times in the radiator to make it to the nearest parts store and bought 4 gallons of antifreeze. Of which I used 3.5 gal.

    I did all that without calling a mechanic and never signing out on my hourly haul.
    New2D12 Thanks this.
  11. House hauler

    House hauler Bobtail Member

    Feb 13, 2021
    Billings, MT
    I have a 2016 T680 with a Paccar MX13. Best thing to do is to remove the sensor from the bottom of the surge tank. The sensor will pull out and will not cause a coolant leak due to removal. Leave the sensor connected to the harness, and place a magnet near the top. If the alarm stops, the sensor is bad. If the alarm keeps going, the surge tank is most likely bad. In my case the alarm became intermittent. It would stop for 10 to 15 minutes then start again. Bought a new sensor from Kenwprth for $150 and fixed the problem. The surge tank in non-serviceable so that would have sucked.
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