Hi George,

yes, the fan should work. Check if it is working by wiring it directly to 12V,
If not renew it, if yes the temperature sensor may be faulty. There is a dedicated one for the A/C I guess, but I currently don‘t remember where, perhaps anyone else can help.

Good luck!


Regards,


Alex

2 typs of relay may be in, with or without a fuse

Dear George,

As Alexander correctly pointed out, the sensor for the fan must be faulty - it mostly is if the fan does not work properly. It should switch on automatically if the coolant temperature is beyond 100 degrees Celsius.

There are two different sensors: one with two pins on its top and one with three pins for cars with A/C. So you will need the latter.

The coolant may get hot easily with the A/C working and high temperatures outside around 30 degrees and higher. The reason is that the A/C radiator that sits in front of the cooling system radiator gets hot and the cooling system radiator is exposed to that heat and the high outside temperatures. That’s why both must be working properly to avoid overheating. The sensor should not be more expensive that 30 quid (approx 34€ in Germany). You should get it at any Mercedes dealer or at Halford‘s.

Good luck and all the best.

Cheerfully yours,
Peter

Yes, George, that‘s the one with the „red hat“ and it should have three pins.

Cheerio
Peter