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Hi, my SLK interior heater is stuck on permanatly even in the off position. In position 1 it comes on slow and positions 2, 3, 4 & 5 are normal. It's when I try to switch it off it stays on full even when I take the key out!. Does anyone have any idea if this could be the heater relay or needs a whole new fan heater. Thanks
 

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Sounds like it might be a faulty resistor (the one connected to the blower motor), when I've put non original ones in r170's they've given that same fault...
 

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Common fault over time in all cars. I've had it happen in Peugeots, Vauxhalls, & even my 99 SLK.

Just get a new resistor/thermo. Bolts onto the bottom of the blower motor under the upper LH footwell cover. 1/2 hour job & guaranteed neckache :smile:
 
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