Thread: Super annoying low coolant alarm going off until car warms up (earth issue??)

Originally Posted by DiscoMick

I wonder if the service and refill has released corrosion and gunk from inside and it is floating around inside and causing problems.
You might need to empty the radiator again, with the bottom hose off, put a slow flowing hose in the top and let the water circulate for maybe half an hour and hopefully flush the gunk out the bottom. Then refit hose and refill with suitable coolant. Doing this can only help.
How old is the radiator? Is it working OK or nearing replacement?

They had the radiator out with the work getting done (timing belt among other things) and I said to check it and replace if necessary, but they checked it and said it was about 40% blocked but all good, so they cleaned it out and put it back in.

I can see a bit of a mark under the bottom hose that looks like some coolant may have been leaking from there, but I check the coolant often and it never drops. Also one of the top hoses had a tiny bit dripping out onto the alternator (a really tiny bit) so I'm keen to take the hoses off anyway and check them. Sounds like a good reason to flush it to me!

Originally Posted by donh54

I use Nulon green in the D1
.

This premix? Isn't it better to use concentrate or doesn't it really matter?

Originally Posted by Young Angus

I can see a bit of a mark under the bottom hose that looks like some coolant may have been leaking from there, but I check the coolant often and it never drops. Also one of the top hoses had a tiny bit dripping out onto the alternator (a really tiny bit) so I'm keen to take the hoses off anyway and check them. Sounds like a good reason to flush it to me!

Often a slight leak only appears under pressure - i.e. when driving. The temp and airflow can dry it up very quickly, and all you see is a slight stain. Wherever there's a stain, treat it as a leak, and attend to it asap.

Originally Posted by Young Angus

This premix? Isn't it better to use concentrate or doesn't it really matter?

With the concentrate, you add demineralised water to it to make a 50/50 mix. Premix this is already done for you. That pic was of the small (4 litre) bottle I keep in the car for topups, and other peoples' emergencies!