Head gasket?

[panhandle]

Hello, I own a 2012 L200, equipped with a 178hp 2.5L D-ID engine. The issue is that it overheats and expels coolant.
When the automobile is idle, it expels water from the radiator.There is no heating in the cabin. I assume the head gasket may be compromised; nevertheless, I am enquiring about other prevalent concerns that may result in this, such as a fractured cylinder head.


I conducted a pressure test on the cooling system, increasing the pressure to 2 bar, with no leaks detected. Nevertheless, if I establish a vacuum in the cooling system, the pressure diminishes rapidly.

 

[BillyBlast]

It seems that you may be experiencing a restriction to regular flow.
Do the interior heating controls operate as expected?
Commencing from a chilly state, with the radiator cap removed...
After the thermostat has opened, is there visible water flow while seeing the radiator cap opening?

 

[panhandle]

Thank you!
Indeed, it started with the vehicle overheating during operation, and the temperature gauge ascended into the red zone. Upon bringing the vehicle home, I replenished the radiator with water and conducted a test. All the water is expelled via the expansion tank during operation. The cabin lacks any heating. However, if I detach the radiator cap and start the engine, water expels from the radiator. The water remains unblended with the oil.

 

[gendoolittle]

Is your engine a 4D56 twin-cam engine? If it is the same engine used in Australian automobiles, then there is a problem over the machining of the cylinder block face. Mitsubishi Motors in Australia had replaced thousands of these engines under warranty due to that specific issue.

 

[panhandle]

Affirmative, 4D56U 16V.

My vehicle has accumulated 260,000 km and is not under any warranty. Are you indicating that the problem is with the engine block or the cylinder head?



I am now apprehensive.

 

[gendoolittle]

If the cause of the overheating parallels that of Australian automobiles, there is an inadequate surface on the cylinder block face. This may be machined to a smooth surface.