Thread: using a RRC low coolant sensor on the TD5 coolant overflow bottle

Is this for cost saving
The better option in my opinion is a engine saver
Low Water Alarm Sensor

Originally Posted by rangieman

Is this for cost saving

No, it’s not. I think the best place to detect coolant loss early and reliably is actually the overflow bottle and that’s how Landrover did it on other models .

Let us know how you go. Mine is in the bleed unit in the top hose. Second best to tank but in a cross flow radiator still an excellent spot for overheat protection. Cheers

Originally Posted by jbe

No, it’s not. I think the best place to detect coolant loss early and reliably is actually the overflow bottle and that’s how Landrover did it on other models .

Each to his own
Some will disagree but me personally i feel the one in the bleed screw at the top is a safer better option when the motor loses coolant it is picked up straight away
But that is my opinion

Just be aware that the reed switch works opposite to what you may think ( on my 91 RRC anyway) and the signal is interpreted by the RRC dash computer.

AFAIR It is closed circuit when full and open circuit when empty so needs relays etc .

You can get swing reed switches from JAYCAR AFAIR that can do the same job but work as you would expect ie open circuit when full and closed when empty.
Regards Philip A

http://www.overland.co.za/Land_Rover...g_circuit.html

This agrees with Philip saying closed when full but also says not for a TD5

Don`t know about a TD5 system but some vehicles can hole the radiator and not loose the coolant from the tank first , if it`s spewing coolant from the tank ( headgasket ETC ) it would tell early .

Would depend on the use as to where was best , i`d suggest .

Originally Posted by rangieman

Each to his own
Some will disagree but me personally i feel the one in the bleed screw at the top is a safer better option when the motor loses coolant it is picked up straight away
But that is my opinion

I hear what you are saying. A friend of mine had a 200 tdi Disco with one of these commercially available engine saver systems (not 100% sure which brand though) and he had endless false alarms even on moderately steep roads. This made me wonder if the overflow bottle might be the better pick up for a low coolant scenario. The last thing you want is to start ignoring supposedly false alarms when it is actually a valid one. Just my thoughts.

Originally Posted by PLR

http://www.overland.co.za/Land_Rover...g_circuit.html

This agrees with Philip saying closed when full but also says not for a TD5

Don`t know about a TD5 system but some vehicles can hole the radiator and not loose the coolant from the tank first , if it`s spewing coolant from the tank ( headgasket ETC ) it would tell early .

Would depend on the use as to where was best , i`d suggest .

Fair enough. I’ll do a little bit more research on this. I’m not in a hurry. This is only one of my long term projects.