VW T-Roc Temperature Issues Point to Blocked Radiator

Having dealt with similar symptoms on my 2020 VW T-Cross last winter, I can share my experience as someone with moderate car repair knowledge. The engine overheating symptoms you describe match what I encountered. Initially, I also thought it was related to the cooling grille or radiator blockage, but it turned out to be a blown fuse controlling the temperature sensor circuit. The inconsistent readings were a direct result of this electrical issue. The fix was straightforward, my workshop diagnosed it quickly and replaced the faulty fuse for 52€, which solved both the temperature reading fluctuations and the check engine light. The car has been running perfectly since then. However, before assuming its the same issue, it would be helpful to know: Are you getting any specific error codes? Have you noticed any coolant leaks? Does the car actually overheat or just show incorrect readings? When exactly did these symptoms start appearing? Car overheating issues can have multiple causes, ranging from simple electrical problems to more serious engine cooling system failures. Without proper diagnosis, its hard to pinpoint the exact cause. I recommend having a professional run a diagnostic scan before replacing any parts. Sometimes what appears as engine cooling problems can be traced back to simple electrical issues, just like in my case.

Thanks for sharing your experience. My latest service was at 75000km where they did a full inspection. After reading your reply, I checked underneath the car and noticed small puddles of coolant. The cooling system seems to be losing fluid gradually. I also got error code P0118 which points to the engine coolant temperature circuit. The thermal management issues started about 2 weeks ago when temperatures dropped significantly. I suspect the cooling grille is not the main culprit as you mentioned. Will take it to the workshop next week to have them check the sensor circuit and look for any obvious coolant leaks in the engine bay.

Thanks for the additional details about the coolant puddles and error code P0118. Unlike my case where it was just a blown fuse, you're likely dealing with multiple issues related to engine cooling. The coolant leak is particularly concerning and needs immediate attention. While my temperature sensor problems were purely electrical, your symptoms suggest actual cooling system issues. The error code P0118 combined with visible coolant loss points toward a potential failing temperature sensor or damaged wiring harness, but the leak needs addressing first to prevent engine overheating. In my T-Cross, once we fixed the fuse issue, the engine cooling system worked flawlessly. However, your case seems more complex. A thorough inspection should focus on: Locating the source of coolant leaks, Testing the temperature sensor and its wiring, Checking the coolant pressure to identify potential system breaches, Verifying thermostat operation Based on my repair experience, you might be looking at around 300€-500€ for diagnostics and repairs, depending on the leak source and whether the temperature sensor needs replacement. Keep monitoring coolant levels until your workshop appointment to prevent any serious engine cooling issues.

Thank you for your valuable input on the sensor circuit issue. Following up on the coolant leak situation: I had the car inspected today and you were absolutely right. The workshop found both a faulty temperature sensor and a cracked coolant hose causing the leaks. The repair cost came to 380€ total, 220€ for parts including the new sensor and hose, plus 160€ labor. They also performed a thorough check of the entire engine cooling system while everything was apart. The thermal management is now working perfectly, with consistent temperature readings and no more check engine light. The radiator grille and airflow were completely fine as you suggested. Really glad I got this fixed quickly before it led to more serious engine cooling problems. Vehicle is now back to normal operating temperatures and no more coolant loss. Thanks again for helping point me in the right direction with the diagnostic information.