V Klasse Diesel Engine Cooling Issues

A restricted airflow could definitely explain the symptoms you're seeing The temperature gauge acting strangely, the check engine light, and the long warm-up time all point to the engine's thermal management not working correctly As for a fuse, it's possible, but not all vehicles have a dedicated fuse for the grille shutters themselves It depends on the specific configuration of your V Klasse Does the grille appear physically blocked by anything If not, you might need to check the coolant level When was the coolant last flushed

I checked the grille, and there's no visible blockage Coolant level seems fine too The coolant was flushed about two years ago Could a faulty thermostat cause similar problems, in addition to a defective fuse

Yes, a faulty thermostat is a very real possibility, and potentially more likely than a fuse issue given your description A thermostat stuck in the open position would absolutely cause a prolonged warm-up time and could trigger the check engine light due to the engine not reaching its optimal operating temperature While I can't definitively diagnose the problem remotely, it sounds like you're past the point of simple DIY fixes I'd recommend taking it to a workshop for a proper diagnosis and repair They can perform a more thorough check of the cooling system components

Appreciate the advice Took it to a mechanic, and you were right, it wasn't a fuse Turns out, it was indeed the thermostat Replaced it, and everything's back to normal now Cost me 52€ for the thermostat and labor Thanks again for pointing me in the right direction