Tucson Overheating Diesel

Sounds familiar. I had a similar problem with my Tucson, though it wasn't overheating all the time, more like intermittently. The engine taking ages to warm up is a classic symptom. I'd put money on the map thermostat being defective. It's a thermostat that's electronically controlled by the ECU, allowing for more precise temperature regulation. Was the temperature gauge behaving erratically before the overheating started?

Thank you for your prompt response. Regarding the temperature gauge, I did observe some fluctuations prior to the onset of the overheating issue. Could you elaborate on the potential implications of a defective map thermostat in this particular scenario? Also, is the replacement of the thermostat a straightforward procedure, or does it necessitate specialized tools and expertise?

The fluctuations you saw are a big clue. A faulty map thermostat can cause the ECU to misinterpret the engine's temperature, leading to improper cooling and delayed warm-up. While you could try replacing it yourself, it's not the easiest job. You'll need to drain the coolant, and access can be tight. Plus, you want to make sure you bleed the system properly afterwards to avoid airlocks. Honestly, for the sake of peace of mind, I'd recommend taking it to a workshop. They can diagnose it properly and replace the thermostat housing if needed. Probably looking at around 350€ all in.

I appreciate your thorough explanation and advice. Based on your recommendation, I shall proceed with scheduling an appointment at a reputable workshop for a comprehensive diagnosis and subsequent repair. Thank you for your time and expertise; it has been invaluable in guiding me towards a resolution.