Coolant on 190E 2.6

[michael1234]

I am finding that I have to top the coolant up on my 190E every two weeks. I cannot find any obvious leaks under the hood. Is this likely to be a radiator leak?

 

[squealinneil]

Hood as in bonnet? This site is based in the UK.
Might be a heater core leak. I've recently learned this can be the source of small, regular drops in the expansion tank level.

 

[turnipsock]

If it's a small leak you might get away with a rad sealer.

Radiator cap is worth checking as it won't show evidence of leak.