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Couple of points,,,

Omega

Active Member
Joined
Mar 9, 2007
Messages
148
Location
West Cornwall - U.K
About two weeks ago, my W211 started to get a wet windscreen interior, so I used the blower more than I ever had. Two weeks ago, I noted that my AC stopped working,,,,, and the clock is 40 minutes slow (or 11:20 fast !). Someone mentioned low voltage, so today I went to check it at he cigarette lighter. But that's dead also.
I guess a fuse is responsible for all these faults.
1) is this feasable ? If so which fuse and where is it please ?
2) If not, any more ideas please ?

many thanks

Baz
 
I remember three fuse boxes. One in the boot on the left as you look behind the carpet. The second is next to the glovebox and accessible when you open the passenger door. The third is on the right of the engine as you look at it - under the black cover near the bulkhead.

It would seem feasible it is fuses but I think the cigarette lighter fuse is probably in the boot and the air con in the engine bay I would think.

It's possible water has got into one of the areas where the fuses are - which could account for a wet windscreen too.

I think that's unlikely and it is a cold time of year so the air cannot hold as much moisture and your breath and ambient moisture will condense on cold glass and as you state, the air con is not working which means it will not be drying the air.

I'd pursue your battery voltage situation as suggested as the W211 is a tricky customer when voltages are not high enough and you will get all sorts of weirdness.

Worth ruling that out first as easy to check if you have a Voltmeter.

You ideally want mid to late 13s (Volts) when off and early 14s when running I seem to remember from my 211 55.

That's what I got when I had a new alternator and all the batteries were newish (the E55 has two so I presume the others do).

Do you know if any of the alternator and / or batteries have been changed?
 
Have you had a look at the drain, scuttle for the windscreen. The hose for this runs to the passenger side under the small battery, cabin filter and some electrics. This could be blocked or leaking.


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JOHN: thanks mate. I sell small plug-in voltmeters, so tried one the other day. With ignition on, it showed 11.7 vdc. With the engine running, fluctuated around 14.11 vdc. I thought this was fine.

WEARSTHEFOXHAT: Cheers for that. I'll check that asap. I had a similar thing with my TE230. The tube ended right above a rubber grommet, through into the cabin. I ended up lengthening the tube to get it over the grommet. I'll double check the carpet for damp again, but higher up the firewall in passenger side.

Someone suggested that because the AC button flashes a few times, might need re gassing,,,,,, not dead, or wouldn't flash. Seems logical to me, but don't want to spend out until I'm certain.

thanks folks for reading this.
 
11.7 volts is not good, it should be above 12
 
Oh, thanks Jock.
Are our batteries 'fill up'able ? Damn, I just sold a gallon of sulfuric acid !
Where is the battery on mine ? I've never had to do anything like this on this vehicle.

I had a quick look at the water egress system yesterday, but as it was raining and I was away from home, it was just a glance. Hopefully have a better look today.

cheers guys
 
Oh, thanks Jock.
Are our batteries 'fill up'able ? Damn, I just sold a gallon of sulfuric acid !
Where is the battery on mine ? I've never had to do anything like this on this vehicle.

I had a quick look at the water egress system yesterday, but as it was raining and I was away from home, it was just a glance. Hopefully have a better look today.

cheers guys
It should be a standard type unless it has been replaced it with a sealed version, it will be obvious when looking at it.
Remove the battery from the car, on a level surface pull the cover and caps off the top of the cells, check the level is above the plates, if not top it up with battery top up water(not sulfuric acid) then connect a charger, when it is fully charged disconnect, check voltage(should be above 12.6) and leave it for a few hours then recheck(if still above 12.6 it's ok, if lower it's shagged)
 
Don't forget that when you unlock the car various ecu's will wake up dropping the voltage plus turning the ignition on will take a bit more out.

May pay to sit in the car after turning off the ignition and waiting for around 15 mins to ensure all ecu's have shutdown then see what you get.
 
If the Voltage is 14.11V with the engine running, I would suspect at least your alternator is working well.

Despite this, if the battery/ies are not able to hold enough charge to sufficiently run everything, you could be getting what I call "brownouts".

I would echo the tests after charging to see if you see a drop.

Have a look at the date code on the main battery too. Batteries tend to last 4 > 7 years in my experience.
 
Someone suggested that because the AC button flashes a few times, might need re gassing,,,,,, not dead, or wouldn't flash. Seems logical to me, but don't want to spend out until I'm certain.

thanks folks for reading this.


My a/c button did that and I ended up needing a new condenser. My indie said the position means it gets damaged easily. Luckily he is happy to just fit parts I buy so was able to save quite a bit getting one from BuyCarParts - 94614 Condenser, air conditioning £83.90

(Double check part number against your VIN)
 
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Thanks guys & gals,

Cigar lighter; fuse gone - replaced - fine
Air-Con: Needed gas - topped up - fine
Wet Screen; seems better now ?!

Battery (100ah) seemed to be 11.7v dc. I usually only use my car to go into town, about 5 miles, so I guess I'm not running enough to charge.
I was on my way to my fabulous Indie about 10 miles away, but as I went to pull in, I realised i'd driven to the actual m.b agents by mistake !
I turned round and went back, but as serendipity abounds, it did charge the battery somewhat. It held the charge of 12v whilst in the garage.
I've started to charge it, with a lidl charger by Ultimate Speed (Kompernass GMBH) and so far got to 12.2, but the charger dosn't say FULL yet, nor go into trickle mode,,,, but fingers crossed, I think will be ok soon, although I think it's taking a bit longer to charge than I would have thought. The charger is a replacement, cos the first one went kaput.
I've had the car for almost 11 years, and at the same address. It's approaching 59000 miles. I've never had the wet screen before. nor battery drain.

Any idea what the name of the nylon screws holding the boot floor down is called ? I want to get, or make a tool to remove 'em. Can't find anything yet.

once again many thanks folks, I appreciate all the advice.
Baz
 
Also check your scuttle area for leaves which may be holding water and your cabin pollen filter - if it blocks water often may overflow into the interior making it more damp than usual.
 
thanks guys.
all done apart from battery.
I'm starting a new post, just for that.
 

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