I have an Audi A3 2.0tdi 2014 that has a very frustrating problem.
The car is leaking coolant when on a run, the coolant is coming from the expansion cap and seems to be caused by back pressure building up in the coolant system. The temperature gauge does not move above the normal running temperature though and I have had no problems with overheating
I have also noticed that the cabin heater blowers are not as hot as they used to be and that the passenger side is cooler than the drivers side.
The car has had the expansion bottle and cap changed, the heater matrix pipes are both hot and the garage checked for combustion gasses in the coolant but could not find anything, so hopefully the head gasket is ok?
Has anyone had this issue and managed to find out the cause please, as I am rapidly getting very frustrated that no one can locate the problem?