Redarc Low Water Alarm bung height

[PeeBee]

I want to add a low water alarm to my new aluminium radiator. How far down from the bottom of the top radiator hose connections is this located? I am assuming that anything below this level would indicate the radiator needs water, but I dont want it so high as to get false triggers if the vehicle is bouncing around.

[Winnie]

I have just read the installation manual and they don't have a specification, but I did come across their "anti-slosh delay" which I think will be interesting for you.
http://www.nissanpatrol.com.au/forums/images/imported/2019/04/1.jpg

Sent from my SM-G960F using Tapatalk

[PeeBee]

Thanks Chris, I think I will see if it can be squeezed in about the same height as the upper temp sender point. I didn't clock that anti slosh delay feature but makes sense. I guess if it comes on a long hill its a matter of referring to the temp sensors as well.

[mudski]

I have that exact unit in my Patrol I thought it had died as it was randomly going off. When I fitted it I had to lengthen the sensor lead by about 12inches. So I cut the sensor lead and made up a small joiner lead with bullet terminals, so the end connector to the sensor was the original one. Turns out the end piece, with the original connector was the culprit.
Weird though, I tested that piece with my DMM and there was absolutely no resistance and the connectors were clean. But it would cause the alarm to go off. Strange. But it works now again.

[PeeBee]

I have that exact unit in my Patrol I thought it had died as it was randomly going off. When I fitted it I had to lengthen the sensor lead by about 12inches. So I cut the sensor lead and made up a small joiner lead with bullet terminals, so the end connector to the sensor was the original one. Turns out the end piece, with the original connector was the culprit.
Weird though, I tested that piece with my DMM and there was absolutely no resistance and the connectors were clean. But it would cause the alarm to go off. Strange. But it works now again.

Thanks Mark, how high do you have it mounted in the tank? Or do you have it mounted in a hose?

[mudski]

Thanks Mark, how high do you have it mounted in the tank? Or do you have it mounted in a hose?

Originally it was mounted in the top tank. Threaded hole was pretty much mid height in the tank. Now its in the top of the stat housing as I've changed radiators.

[jff45]

I have mine on the very top edge of the ally rad where the small bleed hose was. I cut the outlet off and tigged a 1/8 NPT bung in there. It's the highest point possible and I've never had a false alarm.

[the evil twin]

A semi-sealed coolant system IE one with an expansion bottle should have a Rad that is always 100% full, hot, cold, up hill, down dale, wombat holes, barrel rolls or whatever shouldn't matter.

If there is air in the top tank then the coolant is low or there are airlocks, either way it would be indicative of an issue.

Old school system where there is no expansion bottle and the top rad tank acts as the expansion tank as well then, yes, there will be air.