water loss hello i have a mercedes e220 cdi w212 and the last one is losing water, i changed the water pump and oil filter housing and it is still los

[baki]

water loss
hello i have a mercedes e220 cdi w212 and the last one is losing water, i changed the water pump and oil filter housing and it is still losing water. what else should i check. thanks

 

[whitenemesis]

Cracked reservoir, faulty radiator cap, hole in the radiator core, failed solder joints on the radiator header tanks, split radiator hoses ... ...

 

[markjay]

Cracked reservoir, faulty radiator cap, hole in the radiator core, failed solder joints on the radiator header tanks, split radiator hoses ... ...

..leaking hear exchanger... failed head gasket...

You need to pressure-test the cooling system.

 

[Jobsworth]

Did you replace just the front part of the water pump, or the back housing too?

 

[Tonygw]

fuel filter housing is a common failure point