Viano Diesel Overheating Electric Fan Issue

I understand your concern, as I’ve experienced a similar situation with my Vito. It sounds very much like the electric fan itself or the associated wiring. If the electric fan is not spinning, the engine can certainly overheat, especially in warmer conditions or when idling. Have you checked the connector and wiring leading to the electric fan for any obvious signs of damage or corrosion? Is the electric fan totally inactive, or does it attempt to spin at all? Any unusual noises coming from the area of the electric fan?

I haven't really checked the connector or wiring properly, I just gave them a quick look. I didn’t see anything obvious, but I also don’t really know what I’m looking for. The electric fan seems totally inactive – I haven’t noticed it spinning at all lately, and definitely not when the engine starts getting hot. No strange noises either, just the overheating. Where exactly should I be looking for this connector, and what kind of damage am I trying to find?

I recall similar symptoms. In my instance, the issue stemmed from a defective cable or plug connection to the electric fan. While you might be able to diagnose it yourself, given the uncertainties, I strongly suggest consulting a qualified mechanic. It could prevent further damage and ensure a proper repair. It’s difficult to pinpoint the exact location of the connector without physically examining the vehicle, but it should be in close proximity to the electric fan itself, likely on the back of the radiator. Look for any signs of corrosion, loose wires, or damage to the connector housing. However, without proper diagnostic tools, it may be difficult to properly identify the issue. Best of luck.

I took it to a local garage. You were right, it was a defective connection to the electric fan! They replaced the cable and plug, and now the cooling system and electric fan are working fine. The whole repair only cost 95€, so I'm pretty happy. I really appreciate your advice!