Low water warning

Wyle Bill · Apr 25, 2017

brianw900 said: ↑

Has anyone else with a w900 or t600/t660 or t800 had the low water warning light coming on for no reason. This has been an ongoing thing with my w900 and a friend of mine has been beating his head against the wall with the same problem on a t800. I have been through 3 water level sensors and finally replaced the plug and short harness that plug into the back of the sensor and then into another plug a little further back and it has one long wire that goes to the fire wall with a male plug end. This solved my problem but it's strting to happen again. Water level is good on mine so was just wondering if this a common problem. Truck is a 07 and has an ISX, friends truck also has an ISX.
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brianw900 said: ↑

Has anyone else with a w900 or t600/t660 or t800 had the low water warning light coming on for no reason. This has been an ongoing thing with my w900 and a friend of mine has been beating his head against the wall with the same problem on a t800. I have been through 3 water level sensors and finally replaced the plug and short harness that plug into the back of the sensor and then into another plug a little further back and it has one long wire that goes to the fire wall with a male plug end. This solved my problem but it's strting to happen again. Water level is good on mine so was just wondering if this a common problem. Truck is a 07 and has an ISX, friends truck also has an ISX.
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My 09 t660, cummings isx was doing same. Tried eveything from checking loose wires to paperclip in plug. Pulled out sensor from bottom of tank and found white residue on sensor. Cleaned it off with cloth and work perfect now.
Bill Holloway

Celina · May 10, 2020

Shade Tree said: ↑

For some reason the harness and sensor are goofy around getting wet or moisture. If it tends to be a continuous problem and you are the driver and watch coolant level I would have the sensor bypassed in the parameters and unhook it.
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