Radiator water reservoir is filling up

EDDYMUSH

MEMBER
2002 MITSUBISHI COLT
250,000 MILES

I have a Mitsubishi colt double cab with a 4M40 TDI 2800 engine. At speeds above 120KM/Hr for continuous distances of 100Km and above the radiator water reservoir is filling up such that the radiator water level becomes low. This does not happen at speeds below 100KM/Hr. What causes this problem?

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

We need to start with pressure testing the system and make sure there are no leaks, and it holds pressures.

Here is a guide that will help with this:

https://www.2carpros.com/articles/radiator-pressure-test

If it holds pressure, then we need to move onto checking the head gasket and make sure it is not blown.

https://www.2carpros.com/articles/head-gasket-blown-test

If all this passes, then I would suggest changing the radiator cap and finding out if this solves the issue.

Please run through all this info and let us know what questions you have.

Thanks