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Old 10-05-2017, 12:38 PM   #1
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2002 HR Neptune 34PPD DP Low Coolant Light

Coming back from Michigan to SC the low coolant light kept coming on intermittently. I checked the level and it was right between the upper and lower limits on the tank.

Could this be caused by a bad radiator cap? Or maybe the sensor itself is bad. I can see the sensor on the side of the tank. I giggled the electrical connections to it and it didn't help.

The only radiator cap I could find was a 13 lb . It takes a 10 lb. Not sure if this will effect the cooling system significantly.

Cumming ISB 275 engine.
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Old 10-05-2017, 04:05 PM   #2
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The sensors can go bad. A sure test would be to fill the overflow tank to the top and see if the light goes out. You might have to check the tank as soon as the light shows, to be sure the radiator system hasn't absorbed more coolant and reduced the level. Also, 'giggling' the wires, does that mean you told them jokes? tickled them? You might disconnect them and clean the contacts.

If your engine requires a 10 lb radiator cap, Google shows lots of results for a "10 PSI radiator cap." A 13 PSI cap should allow a slightly higher temperature than the 10 PSI cap, as the 10 would lower the boiling point of the coolant temperature. I'd make sure you have the proper cap, perhaps a previous owner put the 10 PSI cap on for some reason.
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