Radiator fan help

[Tazz666]

When I take the switch off the ignition and remove the key, My radiator fan decides to switch on at full speed even when the engine is stone cold,
I have changed the radiator fan control modual, which I finally found bolted to the front panel underneath the headlight in the front wheel arch housing.
Would the temprature sensor in the block be at fault? Or what else could I be looking for at fault.
Thankyou for any help given

 

[television]

Do check for water or damp in the control box with the 2 lids, you may have to lift the SAM and look underneath. if any damp then get the 2 modified lids and seals

 

[Tazz666]

Do check for water or damp in the control box with the 2 lids, you may have to lift the SAM and look underneath. if any damp then get the 2 modified lids and seals

Would that be on the left or right of the engine bay and where would I get these modified lids?
Thanks again

 

[television]

I have the MB part númber if I can find it, its off side I think, only one has 2 lids

 

[Tazz666]

right I know what one you mean now it is on the offside of the car, Thankyou sir, you are a gent, and I really do appreciate the advice

 

[television]

I can only give you the known faults that are in WIS, this was a very common problem a few years back and ha been quiet of late.

That control box behind the bumper can fill with water, and that was the most common of all

 

[Tazz666]

I checked that one and the old one was bone dry on the inside, But I changed that any way, I will checked the box with the lids tomorrow, and sir, you are deffinatley helping me where ever the source is from you have took the time out to help me so I stand by my last comment,you sir are a gent