radiator water reservoir is filling up

2002 MITSUBISHI COLT
250,000 MILES
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EDDYMUSH
  • MEMBER
  • 1 POST
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?
Jan 16, 2012 at 2:50 AM
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KASEKENNY
  • ✓Experienced 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
Feb 14, 2022 at 10:55 AM
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