Borat

My 2008 3.0 q7 tdi has had issues not warming up. The garage replaced thermostat water pump and a one way valve pipe. They said it gets to temp now but as soon as driving it drops to cold again. They said they cant fix it so i need to collect car and take elsewhere. Is this something anyone has heard of or knows how to fix as i need a working car and they clearly dont want to do anymore for me

My 2008 Q7 3.0 is causing a garage a headache and i am looking for any help. It wont warm up past 50-60 on motorway and when sitting idle goes to 90 and stays but as soon as driven off drops back to 50-60. Garage replaced thermostat the water pump and t piece one way valve and still doing it. They are now saying there is anothet aux water pump and if that is changed it will be all they can do. Has something been missed maybe coolant temp sensor or some googling says like the maf sensor. I just cant keep throwing money at this and it never gets done. They also said lots fuel around the injectors but not the seals and getting low fuel rail pressure codes but again they cant see any issue

The garage have said they found a second thermostat attatched in a pipe/hose and it was not working. Have tried to order but audi said 2-3 weeks back order. I hope this will fix it 🤞

Ok i will tell my garage man to try these things. Thanks

Hi, my 2008 q7 3.0 tdi will no longer get to full temp on the guage. It will go to about 50 and sometimes 90 after a long time but if i stop then next drive will just stick at 50-60 and refuses to goto normal 90. Garage has replaced thermostat and water pump but they say it still it wont warm up. Is there something they have missed as it never overheats just runs cool all the time. Please help :)