Peugeot 308 Coolant Leak

[JimM169]

Noticed the coolant was low on my car at the weekend and having a poke around underneath I could see a few drops running down the gearbox casing. Checked the hoses etc but all looked OK so guessing it may be the thermostat housing? I couldn't feel anything around it but it's difficult to fully access so may have missed it?
I've checked online and new housings are £200ish !! So rather than shell out for a complete housing what's the likelihood that it's just the seal that needs replacing or is there a history of these units failing?
Has anyone done a seal replacement and got any advice?
Is there anywhere else I should be checking for the leak on that side of the block before I pull it apart!

Car is a 2015 308SW 1.6 BlueHdi 120bhp, VIN number has the BHZ engine code which I believe is the DV6FC variant

Thanks in advance for any input you can give

[ChrisSMorris]

JimM169 said:

Noticed the coolant was low on my car at the weekend and having a poke around underneath I could see a few drops running down the gearbox casing. Checked the hoses etc but all looked OK so guessing it may be the thermostat housing? I couldn't feel anything around it but it's difficult to fully access so may have missed it?
I've checked online and new housings are £200ish !! So rather than shell out for a complete housing what's the likelihood that it's just the seal that needs replacing or is there a history of these units failing?
Has anyone done a seal replacement and got any advice?
Is there anywhere else I should be checking for the leak on that side of the block before I pull it apart!

Car is a 2015 308SW 1.6 BlueHdi 120bhp, VIN number has the BHZ engine code which I believe is the DV6FC variant

Thanks in advance for any input you can give

I have a 2017 Traveller with the same engine, that lost all its coolant. It was due to a core plug on the EGR that popped. Its right down the back of the engine, so might be worth checking.

[Benson11]

Normally its common to replace the whole housing as heat cycling of the plastic makes them a bit unreliable in a remove/refit scenario and not a risk you want to bother with if you are doing the job for a paying customer.

Of course if you are doing the job yourself and you don't mind the risk of a failed repaired its worth a punt on just doing the gasket, but you might find on removal of the part cracks in the plastic etc.

If you can find the part number for the item, try searching it on Google, ebay and autodoc and you might find some cheaper options, it'll probably be common with some other vehicles