Thread: Low Coolant Alarm, anybody know anything about this one??

Attach a pic about the sensor too maybe we figure it out

That seems like a lot of wires for what should be a basic sensor.

As sierrafrey says a pic of the sensor (and any model/part number if it has one written on the sensor) would be helpful.

pics of the buzzer and light might also be useful in identifying the part.

Actually you are in (some) luck.
I found that unit: GENR8, High Performance Auto Electrical

Product Summary: Coolant Level Warning Module 12/24V
Voltage: 10-30VDC
Connection Type: 6 Fly Leads,

Wiring Legend;

Red - Ignition Supply,

Black - Earth,

Blue - Probe,

Brown- N.O. Relay Contact,

Yellow - C. Relay Contact,

Green - N.C. Relay Contact


Protection: Unit Is fully Potted In Epoxy Resin
Overall Height: 22mm
Overall Length: 65mm
Overall Width: 32mm
Application: For Extra Heavy Duty Applications
Notes: Suitable for water based applications only, Slosh time to prevent false trigger, Hermetically sealed, failsafe circuitry, audible and visual warnings

If you click on 'parts' in the above link it should show the probe etc you have (or if you don't have it, that you need to pair with it)

You're a superstar Vlad!!
I did spend ages googling and never found that product

Now I just need to work out how the NC/C/NO relay wires work? I presume that the unit feeds a relay that then drives the light and buzzer?

C

Here's a diagram which illustrates the C (common) Normally Open (NO) and Normally closed (NC) contacts, for a particular style of relay. I'm not sure what exact relay you'd need for this set up though, hopefully someone can come along and help with that.
relay.png

These are quite useful introductions to relays:

Automotive Relay Guide | 12 Volt Planet

How An Automotive Relay Works and How to Wire 'Em up - YouTube