Hi everyone, i drive a 58 plate mondeo 1.8 tdci and i noticed a leak by the thermostat housing so i emptied the cooling system and undid the 3 screws holding the housing and then i removed the thermostat wich had a seal around it. I replaced that seal with a new genuine one, cleaned that area and put everything back but now is still leaking. Did anyoane experienced this before? I am thinking now to change the housing or the thermostat. At this moment the cooling system is working fine, except the leak. Or is a good ideea to use some appropiate sillicone for this job when i put the housing back to create a seal, would that work?

Welcome to the family Adrian.

I had exactly the same issue on my 57 plate, although a replacement seal made all the difference. Its not uncommon that when you seperate the thermostat to replace the seal it can crack the thermostat housing and contribute further leaks.

Hi, a little update after a long time. I tried to use silicon to seal the leak but that didn't work. I bought from eBay the whole casing already assembled containing the housing together with it's seal and the outlet pipe that goes to radiator hose and inside it had the thermostat with it's seal. That fixed the leak and it cost me just 16.50 pounds( from outside uk and it came in 7-8 days. The uk sellers sale this for 38 pounds)

Sounds like a good buy, I should really fix mine as it still drips but nowhere near as bad as before.