R170….SLK…. Heater Blower

[greg palmer]

Hi,
Possibly old question but couldn’t thread…..
My blower has stopped working, but actual motor works fine out if car. Anyone got the wiring diagram details of the 3 wires on the plug ie voltages and which does what ?
I need to confirm voltage at motor as I can’t find a fuse for it.
Thanks

 

[Jobsworth]

Sounds to me like a problem with the heater blower resistor unit

 

[greg palmer]

Sounds to me like a problem with the heater blower resistor unit

Hi, yes, understand however I’m not sure it’s as simple as that because the plug has three wires, I’ve got 12v perm, earth ( both thick wires) and the middle, thin wire, has nothing on it, engine on/off and turning the control knob,….. I would expect a variable voltage on that…… so possibly a fuse but I can’t find one !

 

[Jobsworth]

Here

 

[greg palmer]

Here

Hi,
Thanks, that’s exactly what I wanted….. now,
I’ve checked again and I have 0 volts on the thin wire, so my next Q to you is , do you know where that wire comes from ( rotary control nob?) and what fuse number it’s associated with.
Thanks in anticipation

 

[Jobsworth]

It’ll be in the underbonnet fuse box, on the driver’s side of the car, but they change a bit from year to year. There should be s legend on the underside of the lid. You are looking for Tempmatic, probably a 5A fuse.

 

[greg palmer]

It’ll be in the underbonnet fuse box, on the driver’s side of the car, but they change a bit from year to year. There should be s legend on the underside of the lid. You are looking for Tempmatic, probably a 5A fuse.

Hi again, yup, that’s the one, fuse 36, it’s fine so there’s a problem between there and the plug to the fan……

 

[greg palmer]

Have you got a wiring diagram for that part of the loom ?

 

[greg palmer]

Have you got a wiring diagram for that part of the loom ?

Update,
Thanks to info received I have proved the motor works, and at variable speeds, so the problem is the missing voltage on the control wire…. Now to remove climate control unit.

 

[greg palmer]

Update, replacement climate control from scrap yard, £20, all working now, thanks to everyone for help, particularly JOBSWORTH.
Thanks again