Contactless low water coolant level alarm project. use original expansion tank

Sounds interesting - keep us posted.

P.S. your photo links need checking.

Oh I see not much good without pictures .I used google pictures so works on my home computer.Will try and edit later.

Shared photo link (I think)
https://goo.gl/photos/h9MjoPeac8J1ZWMN6

Interesting.
Depending on where you position the sensor, you may experience a lot of false alarms as the cars bounces and rattles down the average road.
You will probably need a timer delay unit in the circuit.

Also what effect will heat have, it gets prety warm, that will affect resistance etc.

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I think the positioning of the sensor would be critical to stop false alarms . The sensor seems to have some built in delay on testing quick loss and recovery of water in the sensing area does not set it off but obviously something like driving down a hill may cause problems if mounted too high
I had a quick test at lunch on the connect

can you please keep your drawing plan clear as can't understand this thanks

Best I can do at the moment.

This looks like my kind of project! Simple, cheap and, if it works, very useful. I'm gonna give it a go. Except that the person selling the sensor is away until 1st February. :doh:

Well I have been using this for about a month and all seems to work well no false alarms and does not seem to be affected by the heat of the engine bay, I have spliced into the white wire that goes into the ecu and gives a 12v supply when the ignition is on and wedged the sensor between the expansion tank and the bulk head. will update with a video when I get more time. but if you want to build your own I can recommend it it may not be the most complicated system out there but seems reliable and works and is better then nothing.

I've been following this little project with interest. It appeals to me as I know more about electronics than I do about cars! I have all of the parts and just need some time to put it all together. Did you manage to get a connector that fits the connector on the sensor or did you cut that off and hard wire it? Interesting that you managed to wedge the sensor in place. I was planning to use a dob of silicone but I'm not sure it would take the heat. Where did you put the buzzer?