300 tdi low water float switch

THEengineer · Apr 27, 2015

having had my 300 tdi cook its head,i am looking at putting a low water warning system in due to the fact the pump is high up on the engine,i found a mini float switch Water Level Sensor Horizontal Liquid PP Side Mount Float Switch For Pool Tank | eBay

but dont know if this would work on 12v,my plan was fit this switch to the header tank,live in to the switch,breaking on the switch making continuity,(fully closed)but putting power through if the switch opens,too a small warning bulb on the dash,so basically if the water level drops it brings a warning light on,can i use this simple circuit?or do i need a relay?

The Mad Hat Man · Apr 27, 2015

read hippos thread for gaylanders

Pikey · Apr 27, 2015

Brake fluid reservoir switch???

THEengineer · Apr 27, 2015

Pikey said:
Brake fluid reservoir switch???

will it fit the coolant tank?

THEengineer · Apr 27, 2015

The Mad Hat Man said:
read hippos thread for gaylanders

seen that,think the kits are 90 quid,i am tight

Pikey · Apr 27, 2015

THEengineer said:
will it fit the coolant tank?

Dunno but gotta be a way to mod it somehow. other option is make ya own float switch?? it int hard.

The Mad Hat Man · Apr 27, 2015

THEengineer said:
seen that,think the kits are 90 quid,i am tight

yu is talking tosh - float switch from rs - length of red wire length of black wire and a 12v mini led.

RSF43Y050QF | Std internal mount nylon H float switch | Cynergy3

A1612DR | Red LED Indicator Lamp, 12 V dc | Omron

THEengineer · Apr 27, 2015

The Mad Hat Man said:
yu is talking tosh - float switch from rs - length of red wire length of black wire and a 12v mini led.

RSF43Y050QF | Std internal mount nylon H float switch | Cynergy3

A1612DR | Red LED Indicator Lamp, 12 V dc | Omron

sorted,will order them up,i did see a link though and kits were eggspensive

tottot · Apr 27, 2015

Could be worth checking out a boat bilge pump switch,they are 12v.

The Mad Hat Man · Apr 27, 2015

doesnt have to be 12v

Brown · Apr 28, 2015

Looks like a handy thing to fit. Might be a bit difficult finding a suitable fixing point on my spherical TD5 header tank though!

The Mad Hat Man · Apr 28, 2015

Brown said:
Looks like a handy thing to fit. Might be a bit difficult finding a suitable fixing point on my spherical TD5 header tank though!

Why should that be any more complicated than the Hippo mod to a gaylander?

vilguy · Apr 28, 2015

i bought a conductivity probe (well sort of!) kit for my mgtf. Its a universal kit and it works by having 2 screws essentially through the coolant header tank about an inch apart. When the water level goes too low the conductivity is broken and it sets off a light and a little buzzer. It was only about £10 from memory. I will see if I can find them again.

vilguy · Apr 28, 2015

here you go.

prices have gone up a bit it seems! but its still not too bad

Low Coolant Level Alarm 12V Buzzer & LED | eBay

timtheenchanteruk · Apr 28, 2015

Wouldnt an oil temp gauge do the same thing, if it looses coolant/not circulating the water temp obviously doesnt change much, but the oil temp would shoot up.

discomania · Apr 28, 2015

THEengineer said:
having had my 300 tdi cook its head,i am looking at putting a low water warning system in due to the fact the pump is high up on the engine,i found a mini float switch Water Level Sensor Horizontal Liquid PP Side Mount Float Switch For Pool Tank | eBay

but dont know if this would work on 12v,my plan was fit this switch to the header tank,live in to the switch,breaking on the switch making continuity,(fully closed)but putting power through if the switch opens,too a small warning bulb on the dash,so basically if the water level drops it brings a warning light on,can i use this simple circuit?or do i need a relay?

The RR 300tdi had a float switch fitted as standard. Just order the RR part. PRC7925. Wiring is a simple light circuit.

Brown · Apr 28, 2015

The Mad Hat Man said:
Why should that be any more complicated than the Hippo mod to a gaylander?

It's not insurmountable, just needs a bit more thought. I might get a cheap secondhand tank to play with.

Come to think of it, as I've only used about a cup full of water in nearly 40,000 miles, it's not exactly urgent. but it might be useful if I were to spring a leak.

Kwakerman · Apr 28, 2015

Just remember that the coolant tank will pressurise (potentially up to about 15 psi) so you need to ensure whatever you use can withstand it. Brake res float switch wouldn't work as the cap isn't fully sealed, if the system cant hold pressure then the coolant will boil at a lower temperature and you will loose coolant. Pressurising to 15psi raises the coolant boiling point to something like 115 deg C if I recall correctly

The Mad Hat Man · Apr 28, 2015

Brown said:
It's not insurmountable, just needs a bit more thought. I might get a cheap secondhand tank to play with.

Come to think of it, as I've only used about a cup full of water in nearly 40,000 miles, it's not exactly urgent. but it might be useful if I were to spring a leak.

there is no problem!

the gaylander tank is round!

what worked for that will work for your round tank.

discomania · Apr 29, 2015

This needs really no thought - I will mention it again as it seems everyone chose to gloss over my comment.

Buy this: PRC7925 its the proper part for the job made by LR for the expansion tank fitted!

All you need is some wire, an ignition live, and a warning lamp somewhere.

300 tdi low water float switch

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