Wont start and fan running high speed

[Adiash1970]

Hi not long bought my slk 230 1998 auto and it will not start or make any effort too. No click from starter only thing that starts is the fan like it's about to take off . All fuses look good only thing I noticed is central locking not working and someone has pulled the plug on the alarm under the bonnet so tried plugging it back in but still nothing . Also roof won't open either

 

[Doug1234]

Check the water drains and the ecu compartments ,its possible the drains are blocked and waters in the ecu causing these problems.
Fan running constantly I seem to remember is a side effect of this.

 

[ajlsl600]

Also. Check sensor that advises ecm to control, vary? The fan speed. In many cases instructed thru water temp switch

 

[Adiash1970]

Thanks I will check it out

 

[tpn]

May or may not be of assistance to you as I am not familiar with petrol versions. However I have invariably found that no start with fan racing is associated either with the starter fuse-corroded or blown- or the relays.
Identify the relays and switch them over. Sometimes the actual relay, sometimes "corrosion" on the spades.

I used electrical contact spray copiously.

I have also brought power directly from the battery to the starter fuse. This will tell you wherein the problem lies. Make sure it is not in gear, manual or automatic. Obviously it can be the ECU but I have never experienced that.
Let us know how you get on.