c class w202 220cdi blower problem 99 model

[Arnie Gunner]

Hello,

I hope somewone would be kind enough to help?

I have a problem with the blower fan and I am no expert but I suspect it to be the blower regulator, the symptoms are: The fan only seems to work very slightly and intermitantly regardless of what setting it is on, therefore I am driving around freezing with steamed up windows. I know the motor is getting some power and I know the switch works. So what I am wondering is, how to replace this blower regulator and where is it located?

Also any other ideas would be much appreciated.

Many Thanks

Arnie

 

[television]

With a fault in these systems the control unit reverts to 5v to the fan motor(min fan speed) the chances are the fault is in the control unit in Dash.

Malcolm

 

[Arnie Gunner]

Hi Malcome,

Thanks for that, What do you mean by the control the unit?, Is this seperate to the regulator? do you know the testing proceedure?

Many Thanks

ChadArnie

 

[television]

You have a n22 ECU with fault code read out. Are any of the buttons on the air con unit sticking, they are known to be trouble some.

Malcolm

 

[Arnie Gunner]

No I don't think so but I will check this out, would this show as a fault then? do you need a fault code reader?

Arnie

 

[television]

Yes , very simple 1 LED, 1 ressistor, 1 switch, and 3 short bits of wire and a little box to put it in. only snag is you need a chart with what they all mean. but reading the codes is the first step

Malcolm

 

[Wezzel]

I had a problem where the fan switch seemed to have a mind of it's own. If I so much as touched it, the fan would change speed or stop. In the end I took the switch assembly out (the whole unit with the two rotary knobs on - If you prise off the plastic housing at the rear you can see where the electronic switch is located) and sprayed a liberal amount of contact cleaner at it whilst turning the blower knob back and forth.

That was a year ago and it is still working okay.

 

[Arnie Gunner]

Thanks Wezzel I will try that!,

Malcome so are you going to give the recipe for the fault code reader then?! also where can I get hold of the fault code chart?

Many Thanks

Arnie

 

[television]

I will put it up in the next few days.

Malcolm

 

[Richard Murray]

Could be resistor?

Could be fan resistor. Had a similar problem with the blower on my Audi Avant TDi. I replaced resistor (second hand from breaker's yard) and then everything worked fine. I had similar symptons - such as power was definately getting through, but fan was noisy, and didn't work on settings 2 and 3.

Richard

 

[jberks]

Alternatively you may be right and it is the regulator.
Is the system climate or just manual knobs? If the latter, then there won't be any fault codes.
I replaced the regulator on a W210 but I don't know where it is on your model.
Easy to test once you've located it though.

 

[television]

On an 98 E320 The regulator is fitted on the blower unit under dash passenger side, when these go it reverts to 5v slow speed, common source of trouble I think it is the same unit on yours

Malcolm

 

[Arnie Gunner]

Fixed it! I did buy a new regulator (foolishly) before investigating and found it was the same, so I took the motor out and it was as dead as a doe doe, so I thought hum that com looks a bit dirty so I took the brushes out and gave them and the com a clean up with some sand paper!, put it back together with the original regulator and t's as good as new now!. So if anyone needs a new blower regulator part number 210 820 62 10 I have one for sale yours for £60

Thanks every one for your input.

Arnie

 

[television]

There are a whole range of cars that use the same regulator and they do go wrong, its the most common fault listed in WIS, anyway so pleased you did not get cold feet

Malcolm

 

[jberks]

Wouldn't the parts dept take it back even if they just give you a credit note?
Failing that - ebay - someone will snap it up.

 

[disclee]

Had exactly the same problem. Mine was due to the carbon brushes having worn down. Pulled the spring on the carbon brush a little longer and I'm still using it a year later. It'll so sometime and the only answer then is a new motor.

 

[dogsbody]

Your unit shows all the signs of have a dirty contact or connector. If you measure the voltage it will be 12 volts but will not conduct enough amps to run the blower at anything other than minimum.
I would check all the connectors, that is pull them apart and look at the pins to make sure they are not corroded, and also the fuse assembly. Also check the earth return.
This is a common fault with Fords and Vauxhalls, due the crap way that motor manufacturers make their wiring looms.

 

[television]

Your unit shows all the signs of have a dirty contact or connector. If you measure the voltage it will be 12 volts

Most MB climate controls Fans operate between 5 and 12 volt any fault condition they revert to 5volt

Malcolm