Basic Howtochange a thermostat (C270CDi W203) MercedesBenz Owners’…

29 Янв 2015 | Author: | No comments yet »
Mercedes-Benz C 270 CDI W203

Thermostat Housing and Gasket.

‘O’ for oil filter housing.

(Stubby between housing and block – If you it’s worth changing at the time)

The first timers

If you would like to avoid coolant sitting inside the tray….

1st Jack up the car, with axle stands. your self enough to be able to remove the engine tray using 8mm socket.

from above, remove covers using the T27 socket.

what you can move out of the way to make the job

I decided to remove the fuel hose from fuel to pump. I took this off the filter can, and covered the hole to keep out dirt.

I removed, what I can only is a test point, using a T12 and it out of my way.

I also removed the fuel sensor wires.

Allow to cool, and open the header to relieve pressure from

I then removed the water

NOTE: Be aware that may be some pressure still in the

I removed the small bore to the tank (6mm socket),

Then the large bore to the Radiator (7mm socket). And another small bore to the fuel cooler.

I thought it to clean the crud and dirt off the before I unbolted the housing. contaminants from entering my tracts.

I used a water-washable and a tooth brush, washing the dirt with clean once scrubbed up.

NOTE: is one more “hose” under the housing.

This is a stiff 2 or 2 hose with flared It is simply held in place by the force between the engine and thermostat housing. I re used the however, this would be a time to change it if you decide to do so.


It can only be changed when the is removed.

Be aware that the housing is unbolted this will fall away.

this would be a good to check the condition of all your

Remove the sensor wire the housing. Push the small release with a small driver.

Identify the three E12 bolts, one on top, two below.

I to get away with not removing the oil housing out of fear or dropping or seeping water into the oil

I quickly discovered that is much easier with removed.

Once removed, I the exposed area up with a cloth, and coved over to bits falling in.

Using a size E12 torq bit crack off the bolts on at a time, remove.

My housing was stuck to the and took some force to pry it

As soon as it came free the stiff hose’ talked earlier made a break for Falling down the side of the

Keep this in mind removing the housing.

Clean up the with cloth, and scraper if but be careful with the alloy It goes without saying, do not the face!

The new part will with a rubber gasket, fit in place.

Get your ‘short hose’ and press it into the in the block it came from, and up the housing, navigating between a rail and everything else in the while making sure the ‘short stiff hose’ sits in the lower opening in the

Once lined up, get your into the housing and nip them up.

sure the ‘short stiff is in place, and the housing is aligned the block. Once happy, up the bolts, bearing in mind you are tightening a hard bolt soft block, go one step too far and you strip the threads.

Advised is 9 Nm.

Mercedes-Benz C 270 CDI W203

Replace oil filter housing as as possible. Torque down to Strictly speaking, I should used a new ‘O’ ring.

Add this to list, if you like, when your thermostat.

Once start getting all you hoses in place.

I changed my hose at the same time. I left off the radiator hose till I am going to try fill this with coolant before I

Once all hoses are back in mix up some coolant.

Pour the top hose, I managed to get 3 litres the hose before if started to out of the housing.

Attach hose, tighten up

Top up header tank.

On the C270 is an electric water pump behind the drivers side (I checked on my C220 CDI W203 and is no such pump) Switching on the activates this.

I left it for ten min in the hope that it may help air locks.

After a lot of gargling, the stopped.

I then started car and let it warm up.

As far as I am aware I have no air and the car is heating up and cools as it should.

the next few days of running, an eye out for leaks, and check header levels if your paranoid me).

I left the engine off so I could check for leaks.

600miles later everything is ok.

My car up much faster, and blows air within 10min, (80deg 15min) with an ambient of C, travelling almost immediately at

Temp sits in the region of 85 to 95 deg C.

I this will give a to anyone attempting to change a one for the first time.

Save self Ј185 of labour

Mercedes-Benz C 270 CDI W203
Mercedes-Benz C 270 CDI W203
Mercedes-Benz C 270 CDI W203

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