Info re Coolant level screws

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plonkatronix
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Info re Coolant level screws

Post by plonkatronix » Mon Jan 13, 2020 4:04 pm

I wanted to share my findings...
Our bongy had a well proven haydn coolant alarm fitted original, but I'm afraid to say that a combination of factors, mainly that beeps drive me friggin nuts and almost sends me into a fit... made me remove it and replace it with one that doesn't pre check when powered on.
Firstly before removing the original, I added a second stainless screw about 20mm at the same level (between Max/min) in hope to make a better earth for the resistance loop which may have helped the pre beep shut up quicker... Have mainly pure coolant and little water in there and you will not get a reading, when cold and settled you will get one reading and once warmed up you will get a different resistance reading through the fluid as it tries to find earth/ground, I actually thought this would be a good idea so added said second screw onto bottle. All great i thought... Then one day recently I drained down to swap the thermostat housing thus ended up bleeding again, I rely on the coolant alarm to tell me when the funnel needs lifting... but this time It didn't go off!!!
Baffled by this I took the aftermarket one out of the spare bongo and fitted it in place of the original... I proceeded to bleed and it did the same.!
So, I have learned that once up to temperature, the wet and damp steamy environment in the breathing area of the bottle is still causing resistance to jump across from one reading screw to the earth screw making the alarm think the level is ok, quick removal of previous mod and both alarms sound as intended.
I felt I should share these findings just in case anyone else had/has the same idea. Lucky I found out really :oops:
Last edited by plonkatronix on Mon Jan 13, 2020 4:45 pm, edited 1 time in total.
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Re: Info re Coolant level screws

Post by plonkatronix » Mon Jan 13, 2020 4:17 pm

No disrespect to the haydn, it's much better built than the cheap one i have, it's sealed to protect the electronics, stable and as mentioned by many, has saved many disasters... I just feel haunted by the noise after having so much trouble with this van, it got to the point it I was hearing it when it wasn't even going off, even when trying to sleep in bed (in the house not bongy), and every time you turn it on... I had too shut it up and get it out of my head...
Idea for next version... Fit a relay to allow an external device to be switch on, and add option to disable the built in sounder... A recorded voice playback module could then politely tell me... DONT PANIC... but pull over, erm... NOW :lol:
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Re: Info re Coolant level screws

Post by mikeonb4c » Mon Jan 13, 2020 5:24 pm

The strange thing about this is my lca (haydn type) has picked up the occasions when my coolant level has dropped too low. :?
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Re: Info re Coolant level screws

Post by plonkatronix » Mon Jan 13, 2020 6:42 pm

Do you have a second screw going to earth?
After finding this out, I removed the earth mod and joined both screws in parallel on the one wire and both the alarms work correctly as intended, even when fully up to temperature with a steamy bottle... My cheap alarm is a two wire and that failed when using two wire, take off its earth and let it find it through fluid and it too worked correctly
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Re: Info re Coolant level screws

Post by g8dhe » Mon Jan 13, 2020 7:38 pm

Why do you have "Have mainly pure coolant and little water" and not the normal mix, such a high concentration will reduce the cooling efficiency a lot, and its not as if your in the coldest part of the country ?
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Re: Info re Coolant level screws

Post by plonkatronix » Mon Jan 13, 2020 8:01 pm

After spending a fortune on replacing every single metal pipe, I read up on the pros vs the cons on coolant mixes and ratio's, with pipes being thin and the water being the cause I was bias towards more coolant, I'm back with everyone else now at around 60/40 after my resistance checks ;)
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Re: Info re Coolant level screws

Post by haydn callow » Tue Jan 14, 2020 9:18 am

30% antifreeze is good.
http://www.coolantalarm.co.uk
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Re: Info re Coolant level screws

Post by haydn callow » Tue Jan 14, 2020 9:21 am

Our alarm is designed to work correctly with between 30/40% antifreeze. Much more and the resistance is low and the alarm will misbehave.
http://www.coolantalarm.co.uk
Developer of the Mazda Bongo Coolant loss Alarm
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Re: Info re Coolant level screws

Post by plonkatronix » Tue Jan 14, 2020 12:09 pm

Thanks for confirming the correct mix ratio Haydn, I'm at 40% coolant now and all seems to work correctly now when she's up to temperature.

I just mainly wanted to highlight my findings to others regarding the importance of the mix when having a water level alarm fitted.

Any plans for a new version with a switch and a voice module please Haydn, I'll be your first customer
:wink:
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Re: Info re Coolant level screws

Post by haydn callow » Thu Jan 16, 2020 11:00 am

If it ain’t broke don’t fix it......
http://www.coolantalarm.co.uk
Developer of the Mazda Bongo Coolant loss Alarm
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Re: Info re Coolant level screws

Post by plonkatronix » Thu Jan 16, 2020 2:05 pm

That's great if you don't suffer with beeps annoying you then you're jolly and happy as it's not your problem, the whole point of messing was to experiment with a quicker way of shutting up the haunting noise that has become embedded in one's head!, it's because of this pre-warn I have removed it from mine and currently using the cheap one, until I make my own programmable voice coolant alarm :lol:
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Re: Info re Coolant level screws

Post by haydn callow » Thu Jan 16, 2020 2:23 pm

The whole point is, if it’s fitted properly and your cooling system is as it’s supposed to be you won’t have any problems.....suggest you find out what’s up and fix it.
Just saying😇
http://www.coolantalarm.co.uk
Developer of the Mazda Bongo Coolant loss Alarm
Also BMW Clocks
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Re: Info re Coolant level screws

Post by plonkatronix » Thu Jan 16, 2020 3:10 pm

Never mind Haydn, there is nothing wrong with the cooling system... You're obviously missing my point here, noise :roll:
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Re: Info re Coolant level screws

Post by haydn callow » Thu Jan 16, 2020 5:41 pm

But it only beeps for a max 2 seconds when you switch on, you can always put a bit of blue tac over the beeper,
http://www.coolantalarm.co.uk
Developer of the Mazda Bongo Coolant loss Alarm
Also BMW Clocks
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