SQ7 Cooling System: Blocked Grille Causing Temp Issues

A similar issue occurred with my 2019 Audi S6 with the 2.9L engine. The cooling system symptoms matched exactly, erratic temperature readings and delayed engine warm-up. The radiator grille was partially blocked with debris, but this turned out to be a secondary issue. The root cause was a failing coolant temperature sensor, combined with a clogged cooling system. The check engine light was triggered by the faulty sensor readings. After a thorough inspection, the cooling system needed a complete flush to remove buildup that was restricting proper coolant flow. The repair involved: Replacing the temperature sensor, Power flushing the entire cooling system, Cleaning the radiator grille and checking for damage, Verifying proper coolant flow This was a serious issue that required immediate attention, as continued operation could have led to engine overheating and potential engine damage. The erratic temperature readings were masking the actual engine temperature, making it a safety concern. Suggest having both the sensor and cooling system checked by a qualified technician, as these symptoms typically indicate multiple connected issues rather than just a blocked grille.

Thanks for sharing your experience. My SQ7 ended up having almost identical symptoms. The automotive cooling system definitely needed attention, and the thermal management issues were causing those inconsistent readings. After checking the engine cooling components, my mechanic found both a faulty sensor and significant buildup in the system. Was getting a bit worried about potential engine damage before getting it fixed. Quick question, do you remember roughly how much the repair cost in your case? Also, has everything been running smoothly since the fix, or have you noticed any other cooling-related issues pop up?

I can confirm everything has been running perfectly since getting the repairs done on my S6. The thermal management system is now working exactly as it should, with consistent temperature readings and normal warm-up times. The cooling grille restriction was definitely contributing to the problem, but clearing that blockage was just part of the total fix. The total repair cost breakdown for my case: 52 Euro for the defective fuse replacement, 185 Euro for the temperature sensor, 240 Euro for the cooling system flush, 95 Euro for cleaning and inspection of the cooling components The investment was worth it to prevent any risk of engine overheating. Haven't experienced a single cooling-related issue in the 8 months since the repair. The car now maintains steady operating temperatures even during demanding driving conditions. Would strongly recommend getting your SQ7 fully checked and repaired, as these issues tend to compound if left unaddressed. A properly functioning cooling system is crucial for engine longevity.

Thanks for the helpful advice. Just wanted to close the loop on my SQ7 situation. Finally got it fixed last week and wanted to share the outcome. Took it to a different mechanic who specialized in European cars. The car overheating issues were indeed caused by multiple problems. They found a completely clogged radiator grille and a failing temperature sensor. The engine cooling system was also full of debris. The total repair came to 680 Euro: Sensor replacement and programming, Complete cooling system flush, Radiator grille cleaning and repair, New coolant fill Everything is working perfectly now, temperature gauge stays steady, engine warms up normally, and the check engine light is off. The car feels much better overall. Really glad I got it sorted before any serious damage occurred. Much cheaper than I expected and definitely worth every cent to avoid potential engine problems down the line.