Did you check the connector on the bottom of the coolant bottle? Maybe it is just loose. I'd unplug, clean the contacts and plug it back in. Make sure it clicks.
Basically, the cluster beeps when it sees that circuit go open. Open = no continuity = no coolant = beeping. It sounds like yours is an "intermittent open" as you get the warning off and on, otherwise it would just beep once then the graphic would stay on constantly.
Other than a loose connector, the possibilities are:
- Faulty sensor in the bottle
- Faulty wiring
- dirty connector (corrosion)
- faulty cluster
I believe you can eliminate the bottle as a possibility by just jumping the connector with a paper clip or piece of wire. That should close the circuit permanently. If it still goes open at that point, you have a wiring or cluster issue.
Most likely is just a loose or dirty connector at the bottle. Definitely check that first.
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