Vito Marco Polo 112CDI W638

[jeancameo]

Hello,

i'm Gianluca from Italy, i've bought a Vito Marco Polo 112CDI W638.

i've a problem:
there is a pressure in the expansion tank and the coolant exit.

i've have just replace the head gasket and verify the head with no problems, but the problem persist.

now when i start the hot air the temperature drops from 80° to 60/50° and sometimes exit cold air. when i turn to cold air the temperature return to 80°

i've already replace the water pomp and the thermostatic valve.

I would really appreciate any ideas.

thanks and sorry for my English.

Gianluca

 

[Marku]

Hello and welcome - the Marco Polo is a really great vehicle. I can only think that you are still having problems with the cylinder head. Was it checked for being level? Was the engine block? Was the head pressure tested? On the other hand a simple solution might be an airlock in the heater try draining the system and refilling making sure the heater valves are open.