Hi, I have a 2014 2.0tdi Golf VII and l recently got a notification to pull over due to my car suddenly overheating (130 on temp gauge). The car was previously losing coolant but I had it fully topped up. I brought it to a garage and they pressurised the coolant system and all appeared fine so they suggested replacing the cap and since then I have lost no more coolant. A week later, I was driving around 50-60kph and I noticed the temp gauge going up again. I pulled over as it reached 95 to prevent any further damage. I've driven 100km since and no sign of the temp gauge moving past 90 but I have just noticed that hot air is no longer blowing out of the driver side vents and is not exactly piping hot coming out of the passenger side either. Does this mean that the thermostat is likely to need replacing? The water pump was replaced 3 years ago after I discovered leaking coolant so I would hope that's not the issue. Any help much appreciated. Thanks.