Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 212.025 & 906.633
Mentioned: 3 Post(s)
Quoted: 35 Post(s)
I'm not familiar with a Sprinter but my guess is that the electric fan would kick in when A/C is operated or if the coolant temperature gets too high. Normally the coolant temperature should not trigger the fan.
If it has a continuously driven compressor, perhaps there is some additional control taking into account the actual cooling needs, to avoid the fan blowing always (as the compressor would be running all the time).