Hi,
I can't promise this is correct, but it should point you in the right direction. In this diagram, the coolant regulator or thermostat (14) fits into the thermostat housing (10). It looks like the part number might be 03H121113.
I bet it will be a fun job involving lots of stripping down!
Here is the link:
Buy Coolant pump coolant regulator for Volkswagen Passat 4Motion Santana 2007 RDW parts catalog in our car shop
2007 Passat B6 3.2 litre V6 4Motion | Granite Grey | standard 17" Solitude wheels | tow bar
Mods: R36 steering wheel | HP DQ250 DSG tune | HPA Haldex performance controller | Koni sports yellow shocks | Eibach springs | H&R sway bars | Whiteline ALK | Kufatec E-MFA add on | Garage door button | Warning triangle retrofit | Bridgestone Potenza Adrenalin RE003s
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