W203 220 cdi thermostat replacement

[Oli]

Has anyone done this DIY?, would be handy to hear from someone who has, as it seems a bit of a small thing to bother taking it to a garage for.
Where abouts are they located on the 220 cdi?.

 

[silver_star]

I have done mine, its quite an easy job.

Take off the plastic engine cover and all will be revealed to the left of the oil filter housing.

Ideally you need a 1/4" drive torx socket, failing that you can carefully use a 6 sided hex socket. I found the 3/8" drive extension/torx socket a little bit awkward to get in. Be careful not to dislodge any of the plastic fuel lines. Removing the oil filter housing also makes the job a lot easier.

 

[tul214]

Replacing the thermostat is quite easy but you might find as I did that you have to disturb the plastic fuel pipes to get at it. Dependant on age these go brittle and snap.....a simple job soon turned into a larger job for me

 

[Chrishazle]

Try looking here : OK, it says C270 but opening line says C220 is the same :

http://forums.mercedesclub.org.uk/sh...ad.php?t=65685

 

[Oli]

Thanks guys, I'm going to try and get it changed at the weekend.

 

[PRw]

Replacing the thermostat is quite easy but you might find as I did that you have to disturb the plastic fuel pipes to get at it. Dependant on age these go brittle and snap.....a simple job soon turned into a larger job for me

Exactly the same thing happened to me on my 270cdi (part number for my fuel pipe was A6120703232). probably ended up costing me £250 in parts and time. Those pipes are very close to the aux belt. I see that the seller of my replacement pipe typically sells 3-4 of these per month, so it is a very fragile thing, and everytime I get in the car I wonder if it will be the last.

 

[Qwertycls]

What are the symptoms of a faulty thermostat? I note mine varies between 80-90?

 

[PRw]

After repairing mine and on a 20 minute morning commute 80-90 is good. Originally it wouldnt go much beyond 50.

Faulty thermostat: virtually no heat in the cabin in winter. MPG maybe drops from 48-45 mpg.

 

[Dichtung]

A simple check.
If the big diameter hose from the thermostat to the top of the radiator feels to be warm within 5 minutes of the engine starting from cold ;
the thermostat is faulty.
Stuck open.