large coolant loss around back of engine on 2.0 diesel

[danieldavid]

hi Eddie, Petro or anyone who has advice, looked through the 10 pages of entries on forum under coolant but seem to be for petrol not diesel typically, hence new thread. had a coolant leak last year, on forum, from front, possibly egr, solved with k seal, lasted 6 months till recent hot weatyher, smelled coolant while in traffic. presently it takes about 1.5L of water in 5 mins, even with engine off and expansion tank cap off without pressurei can hear it drippping onto under tray etc, attached a pic, the brown water is pooled in middle of pic. need to fix before using again. Does anyone know what its likely to be on diesel, whether theres a vulnerable pipe at back, or likely to be thermostat housing. i cant think its any risk of block damage as temp hasnt gone over 90, though fan going on. 1.5L seems to fill it, so must be litres in it still though wont be using till fix. Ive heard these take 8 to 10L of coolant, 1.5L missing i assume, possibly more, thanks for any advice

 

[EddieJ]

From you pic and info I’d be on the thermostat housing. You can spend a few £ and buy a pressure test kit to confirm. Would recommend really good flushing of the system too to get all the muck out.
The end where the hose goes on, on the smaller ones suffer from degradation and the hose starts to leak, pop in rad weld and get a wee while longer then the rad weld lets go of the cavitated bit only now as a big leak
As well as splitting of course.