New 2001 Vito 108 righthand drive - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 01-29-2012, 07:41 AM Thread Starter
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New 2001 Vito 108 righthand drive

Greetings everybody,

I have been having lots of fun reading stuff on here, trying to get a handle on my 2001 108 Merc Vito (right hand drive) van and it's host of problems.

My heater blows nothing but gentle puffs of air that are always exactly the temperature of the outside world (or maybe the current interior temperature...which is always about the same as the outsid world). I replaced my thermostat (which was a horrific bitch), so now, at least, the engine comes up to operating temperature. Now I can look longingly at the 70C reading on the engine temp gauge while freezing my ass off, and knowing there is something warm only three feet away on the other side of the firewall.

Taking advice from the forum...I then removed the pollen filter. An experience something like serving as the midwife to a giraffe, while laying upside down under the dash in front of the seats.

Now: I have MORE cold air. The fan works fine. No heat what-so-ever.

Now what?

Cheers!
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post #2 of 6 (permalink) Old 01-30-2012, 01:56 AM
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Check the heater relay K29.
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ERIC.

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post #3 of 6 (permalink) Old 01-30-2012, 02:33 AM Thread Starter
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Thanks Eric...

OK. Relay. Fantastic. There are a bunch of them stashed under the passenger seat (not news to you, of course). I'm not sure which one I need to remove yet...couldn't read K29 on anything. Perhaps the seat needs to come off? Here's a picture...if anybody feels like photoshopping in an arrow to indicate K29...maybe that would save removing the seat.

You guys are terrific.

Cheers.
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post #4 of 6 (permalink) Old 02-12-2012, 05:04 AM Thread Starter
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Well, I identified the fourth relay from the left in the front row (facing forward) as the heater relay, using a manual page I found on this forum, located very close to the page Eric so kindly posted.

I replaced that relay. Nothing changed. If somebody has any input about what other relay it might be, I would love to hear about it.

Meanwhile, a mechanic buddy of mine got under the hood and showed me that the van was sucking lots of col ait from the hood into its ventilation system. He then showed me some little, white plastic vacuum hoses. He then got under the dash to show me a lever. He pulled on the lever under the right side and TADA! heat now comes out of the vents and to a minor extent, the defroster.

He didn't really have any answers though, other than to say that the control nobs are probably malfunctioning or the vacuum hose could be leaking.

So where does that leave me? If it is a relay, its not the one I replaced.

Next questions:
1.) Where do I get the manual they use to fix this kind of stuff in the shop? I have the Peter Russek manual, which says precisely nothing about the heating system.
2.) How do I change the vaccum hoses associated with the heating system?
3.) How do I change the control nobs associated with the heating system? Do you have to take the dash off? How do you do that?

Thanks everybody.

Cheers
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post #5 of 6 (permalink) Old 02-12-2012, 05:14 AM
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WIS is not very helpful for this vehicle

Make sure this circulation pump is working M10;
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ERIC.

___________________________________________
"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one."
- George Bernard Shaw to Winston Churchill.

"Cannot possibly attend first night, will attend second ... if there is one."
- Winston Churchill, in response.
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post #6 of 6 (permalink) Old 05-18-2013, 12:56 AM
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Hello,

Ive had the same issue on my 110 CDI. first ive replaced the engine thermostat as engine temp never reached operational values (87'C). After that engine temp was OK gauge, was showing just above 80'C, still no heat.
Next Ive removed the pollen filter, which made huge difference in general airflow, but still no heat.
Next Ive removed circulation pump, tested with external power supply (12V), not working. Ive pulled it apart, found brushes worn down and not reaching rotor. Replaced bushes, works again, but still no heat.
Next Ive removed the 3 way water valve, there was no flow in any way! Pulled apart this one also, it has two brass plungers sealing against rubber surfaces, one for each way. cleaned up rubber faces, refitted. topped up coolant and now I have heating to Africa.
Quite honestly if I had to pay for all this, done by a shop, I would have been quite angry, thinking "No way that so much was wrong with a Mercedes" and thinking Ive been ripped off badly...
but guess what, its not over, found ventilation air recirculating flap not working either, I assume the actuator has broken membrane as it has vacuum leak.
Hopefully this helps others to get that heat back quicker!
immi
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