VW Arteon Temperature Issues Signal Cooling System Failure

As someone with some experience working on VWs, I encountered a similar issue with my 2020 VW Passat. The engine cooling system showed similar symptoms, inconsistent temperature readings and delayed warm-up times. After taking it to the workshop, they diagnosed a faulty temperature sensor fuse that was causing erratic readings and affecting the engine cooling management system. The repair was straightforward and cost 52€ including parts and labor. Here are the diagnostic steps the mechanic took: Checked the cooling grille for any obvious blockages, Performed a complete electrical system scan, Tested the temperature sensor circuit, Identified and replaced the defective fuse Before the fix, I was also concerned about potential radiator blockage or more serious engine overheating issues, but fortunately it turned out to be a simple electrical problem. To provide more specific advice for your case, could you share: Are you noticing any actual car overheating issues, or just unusual readings? Does the temperature fluctuate while driving or only during warm-up? Have you noticed any changes in fuel consumption? When was your last cooling system maintenance performed? This information would help determine if your issue is similar to what I experienced or if it might be something different.

Had mine inspected after 126412km and found a faulty thermostat causing similar temperature reading issues. The restricted airflow turned out to be related to debris accumulation in the cooling system. Technician performed a complete flush and replaced the thermostat. Total repair cost was 320€. Engine overheating issues completely resolved after the fix. Temperature now reads consistently and warm-up cycle is back to normal, about 5 minutes in moderate weather. System scan revealed stored fault codes pointing to the thermostat. Worth checking if you have similar codes. The car overheating symptoms disappeared immediately after the repair. Last service was done 2 months ago with no issues reported at that time. Problem developed gradually over the past few weeks.

Thanks for sharing those details. My experience with the fuse turned out to be just the first part of a similar issue. After the initial repair I mentioned, I also started getting thermostat-related codes within a few weeks. The thermal management system eventually needed a complete overhaul just like yours. My radiator grille was actually partially clogged, and the debris buildup was affecting the entire cooling system performance. Final repair on my Passat included: Full cooling system flush, Thermostat replacement, Cleaning of the cooling grille assembly, New temperature sensors Total came to 295€, slightly less than yours but pretty close. The car overheating concerns disappeared completely after the comprehensive fix. Like your case, my engine now warms up properly in about 5 minutes. Key learning was that these automotive cooling issues often have multiple connected causes. The initial fuse replacement masked the underlying thermostat problem. Would definitely recommend anyone with similar symptoms to get a complete system diagnosis rather than just fixing the first issue found.

Thanks everyone for the helpful feedback. My Arteon is now running perfectly after the repairs. The restricted airflow from debris and failing thermostat were definitely the culprits. Good to hear others had similar experiences and successful fixes. For anyone searching the forum later with similar car overheating issues: the complete system diagnosis route is definitely worth it. The initial 320€ repair cost was reasonable considering it fixed both the automotive cooling system problems and temperature reading inconsistencies. Most important takeaway was not ignoring the gradual onset of symptoms. What started as weird temperature readings could have developed into serious engine overheating if left unchecked. Regular maintenance checks would likely have caught the radiator blockage before it became a bigger issue. Now tracking my maintenance schedule much more carefully. The comprehensive repair ended up being the right call versus trying partial fixes.