Hi guys I hope someone can help
I have an A3 2010 sportback 1.6 tdi
Basically going around town perfectly fine even at temperature, it doesn't rise.
The minute I take it on the motorway after about 7 miles or so it starts to over heat. But its not loosing water if anything the light would come on the dash saying "no coolant please pull over" so I checked it but the coolant was higher than it normally was, so I thought it was the thermostat sticking so I had it changed, still the same issue, garage took it for a drive and advised that the radiator at temperature was stone cold , but at the same time told me its over pressuring pipes was so hard to squeeze, so I bought a new over flow bottle cap (cheap possible solution) and got the garage to change the rad as they explained it looked rusty.
Again still over heating with pressure in system.
Now they are advising it could be a split head, gasket , or might possibly the water pump
Had the water pump and Cambelt done 2.5 years ago and only done 15000miles since.
Downfall of the head and gasket is that I thought if that was cracked or gasket is going then surely I would be loosing water ? Which I am not ? And also if it was the head or gasket surely it would overheat straight away driving it around town ? It seems as if I put my foot down and go at a higher speed it pressurise alot In the system which causes it too over heat ?
Can anyone shed any light on this please or if they have come across the same issue as now I am completely stumped and really don't fancy forking out 1500 odd on having the head sent away to get checked and possibly skimmed and also all new gaskets.
