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Old 10-07-2022, 06:23 PM   #1
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Coolant is not low but dash says it is

I have a diesel pusher and my dash display keeps saying that it is low on coolant, but when I check it, the plastic bottle reservoir shows that it is almost full. How is it getting this false signal?
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Old 10-07-2022, 06:38 PM   #2
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The plastic overflow bottle does not connect to the dash warning light, nor is it a reliable method of determining coolant level.
The coolant system should have an "expansion tank" with a standard radiator cap. (this is between overflow bottle and actual radiator) There is usually a sight-glass on one end/side. That is the manual-method of determining coolant level.
When your engine coolant is cold, remove that radiator cap and look inside to double-check the sight-glass level. If coolant is low, fill to top of radiator cap neck and replace cap.
When coolant expands it will flow into the overflow bottle. Then when the engine cools and coolant contracts, it sucks coolant from the overflow bottle.
Fill coolant bottle to the "full cold" mark every time coolant level drops below the line.
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Old 10-07-2022, 07:30 PM   #3
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Good advice above.
If radiator is full when checking cold by removing cap you may have a bad sensor. If so you will need to check w/ chassis mfg to determine where sensors are located and how to test / replace.
If expansion / overflow tank is "full" and radiator low you may have a leak in the hose / connection that is supposed to draw coolant back to the radiator via vacuum when it cools.
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Old 10-07-2022, 07:47 PM   #4
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You either have a sensor in the expansion tank that is bad or needs to be cleaned. Some had issues after a coolant change. The sensor needs to be removed and scrubbed with a scotch brite pad.
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