Rob b Posted March 4, 2021 Share Posted March 4, 2021 Low coolant alarm comes on at random times .reservoir is full.even changed low fluid sensor .any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/ Share on other sites More sharing options...
Joey Mack Posted March 4, 2021 Share Posted March 4, 2021 what year truck Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-469971 Share on other sites More sharing options...
Ivoromeu Posted April 5, 2021 Share Posted April 5, 2021 Having same issue, Mack granite 2014 mp8. Bad Coolant level sensor?! Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-472056 Share on other sites More sharing options...
Mackpro Posted April 5, 2021 Share Posted April 5, 2021 On our CHU’s and CXU’s , we have be having to replace the short harness from the front chassis harness up the the coolant level sensor. . Either the harness ends went bad or wires pulled apart inside the insulation. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-472064 Share on other sites More sharing options...
MackTech Posted April 8, 2021 Share Posted April 8, 2021 I know that occasionally the coolant level sensor will go bad, if it's not the harness that Mackpro suggested, I'd try the sensor. Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-472190 Share on other sites More sharing options...
Ivoromeu Posted April 8, 2021 Share Posted April 8, 2021 Thank u guys. Already had sensor ordered when I asked, and didn’t solve it. So harness will be next. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-472216 Share on other sites More sharing options...
Jamkar Posted April 8, 2021 Share Posted April 8, 2021 Rob b did you get it sorted? Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-472273 Share on other sites More sharing options...
DAWN Posted February 3, 2022 Share Posted February 3, 2022 HI DO YOU HAVE THE PART NUMBER FOR THAT SHORT HARNESS? THANKS Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-488438 Share on other sites More sharing options...
Mackpro Posted February 3, 2022 Share Posted February 3, 2022 I remember the parts guys had a hard time finding the harness in the parts break down but lucky for us the tag was still on it and the part number was readable. Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-488445 Share on other sites More sharing options...
RFCDrum Posted February 13, 2022 Share Posted February 13, 2022 Inside the plastic surge tank is a ring with a float. The low coolant sensor sits in a pocket not touching the coolant it reads the ring. They go bad and get stuck on the bottom so the sensor thinks it is low on water. Can't get to it have to replace the plastic surge tank. Just had to do this on my 2010 Granite that I drive daily. It would also derate the motor. Very annoying. Cheers. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-489299 Share on other sites More sharing options...
mowerman Posted February 13, 2022 Share Posted February 13, 2022 Not sure about the max on our kenworths all you have to do is pull out the plug and the light will go off I don’t recommend it but it will get you through until you have time to fix it .. Bob Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-489305 Share on other sites More sharing options...
Wifeofatrucker Posted August 6, 2022 Share Posted August 6, 2022 Can you buy a brand new but defected plastic tank. My husband changed the harness and replaced the reservoir plastic tank and it’s still reading low fluid stop. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-505453 Share on other sites More sharing options...
Joey Mack Posted August 6, 2022 Share Posted August 6, 2022 do you know how to weld plastic?? its actually easy to do.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-505470 Share on other sites More sharing options...
Dirtymilkman Posted August 7, 2022 Share Posted August 7, 2022 I replaced my tanks to steel instead. Quote Link to comment https://www.bigmacktrucks.com/topic/66129-low-coolant-alarm-going-off/#findComment-505507 Share on other sites More sharing options...
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