Viano 3.2 W639 - Coolant Circulation Pump error

[accumulator]

Hi All,
Does anyone know where the aux circulation pump is located on Viano 3.2 w639? I have fault on scan tool come saying its not working properly, and open circuit or live to earth fault. Are they expensive. Do I really need to replace it?

 

[optimusprime]

This is the part to look for --its location on the car i will search and let you know. A new one is £350 after market ..

 

[optimusprime]

News is you have three pumps of one type or another --one main coolant pump - two is the pre heater pump and last a secondary coolant pump .

 

[optimusprime]

May be some one with a full workshop manual will post up a picture to help you more .

 

[accumulator]

Thanks Optimusprime. On MB II Icarsoft, it gives me a error code 'Component M13/5 (Coolant Circulation Pump) does not work properly. Short circuit to positive or open circuit'. Does that help in regard to finding the correct pump? I am assuming its not the main one on the engine, but the other two electrical ones, wherever they are.

 

[optimusprime]

accumulator keep looking in some one will help you i know nothing about this engine only what i found on line .You will need to look for both the pumps i sent in the pictures and go from there . I would hazard a guess and say the pump will look like the smallest of the 2 in picture i posted .Look in the engine for it they are,, as a rule are fitted in the centre of a water hose so it sends coolant through the system .

 

[accumulator]

Doing some more research, on some model mercs, there is circulation pump built into the duovalve that controls the heating abd AC. Some guy has done a DIY repair on the motors replacing the bushes. etc

Coolant Circulation Pump - W220 S-Class Encyclopedia

 

[accumulator]

I don't know where the duovalve is? is it under the dash, or in engine bay? Who knows, I will have look later on see if can see it.

 

[optimusprime]

Dont know if you have one of those duo valve but they were install in some models .This would show up with a fault with your interior heater .output .