My only problem with just a low water alarm is the fact that the engine can run hot even tho it's perfectly full of coolant!
I had issues over the summer with my Tdi running (what I think was) too hot under load with air con on. Air off, not a problem. 
So the issue with just a low coolant alarm is that it doesn't tell you how hot she's actually running at any given moment. 
You can get gauges that 'alarm/warn' you when the coolant has reached a specific temperature.
				
			 
			
		 
			
				
			
			
				Arthur.
All these discos are giving me a heart attack!
'99 D1 300Tdi Auto ( now sold :( )
'03 D2 Td5 Auto
'03 D2a Td5 Auto
			
			
		 
	
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