Stuart. B

Garage say its coming from the expansion bottle cap when under pressure but they have put 2 new caps on and a new bottle and still having the water leak problem

Hi there, I'm new to this club and I'm hoping I can get some much needed help and info. I've got a 2007 A3 2.0tdi 170 and I've recently had a cooling problem. I'm loosing coolant from my expansion bottle I think as I can hear it dripping onto the manifold after I drive it. Its in the garage atm and they have checked the egr valve and it's not that, the garage is baffled aswell as my self. Has anyone any idea of the problem. Thank you for any info.