Audi A6 my sons car is coolant level dropping weekly but no sign of a leak….But his car from Arnold Shark with a 3 month warranty which lukily he still has 2 montjs of it. Any idea what it can be. Car does not over heat

If it's a diesel it may well be the EGR cooler. That's an expensive repair so he should return the car to the dealer before it is too late.

He is calling them tomorrow as the car is still under warranty…. 

1 hour ago, cliffcoggin said:

If it's a diesel it may well be the EGR cooler. That's an expensive repair so he should return the car to the dealer before it is too late.

It and Audi A6 2.0 Diesel… doesnt overheat drive ok. Just coolant dropped last week he fill it up to max n then today when i checked it again it had dropped levels. He called them today amd it was closed. Hes forces n live in ireland so a bit of a bum really so im dealing with them tomorrow!!! Hopes its something more simpler than that as he youmg and stresses out

Whatever the cause, and it may be something else, get the dealer to sort it out.

5 minutes ago, cliffcoggin said:

Whatever the cause, and it may be something else, get the dealer to sort it out.

Just seen a wet patch bottom of belt, dried it with a bit of tissue, looks like coolant soncould be water pump!

 

thanks mate amd will do….

Does indeed look like water pump Donald - if belt driven pump. 
Kind regards,

Gareth.