ithinuel

Thank you all for your messages! I didn't know about the self study program, it's a great resource! But either way, that's beyond my ability to fix so I'll get in touch with local garages and see what they quote me 🤷‍♂️

@Warrior193Thank you Yes it is a Diesel engine. @EnterNameThat is (to some extent) what i thought it might be (something related to some by pass valve openning too late). Am I correct in thinking that if it were a water pump issue, the engine would always overheat rather than only once oil temp reaches a high enough temperature but only for a little while ? Is there a way for me to differentiate between a valve stuck while cold issue and a sensor calibration issue? Is there a manual that would explain all this? (the owner's manual is pretty much useless when it comes to maintenance & diagnostic). Do the temperature display use a different probe than the value controller? If I had to guess, I'd assume that the ECU's using an hysteresis to control the valve and I'd look at what's the setting for the triggers but I have no clue about what tool to use the check that (maybe using some OBD2 device?🤷‍♂️).

Hello, I noticed something new since the last service of our Rapid Spaceback (from 2017 1.4TDI 90HP DSG) got service early February. We don't use it much so we only noticed it about 2weeks after the service so not sure how related it is. In short, what happens is that when starting cold, the engine's temperature normally rises to 90°C and stays there until the oil temp catches up. When the oil temp reaches around 70/80°C, the engine's temps also goes up. I have to remain gentle on the acceleration to keep it from getting too hot. In the mean time the oil temp continues to rise up to ~100-110°C (depending on the road/traffic). After a little while, the engine's temp goes down to its usual 90°C and nicely stays there until the engine's cut off. I am yet to find out what's causing the temp to finally go back down and identify what's causing this behaviour. It only seems to do this from a cold start. According to the garage, I'm due to change the cambelt because the car 5yo+ (although only 51000km). Does anyone have an idea of what could be doing so and how I can verify if it is indeed the case?