Question about 1995 Mitsubishi Montero

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Hi, My 95 2.8 Pajero (turbo deisel) has been overheating. I have replaced the thermostat, water pump and the rad cap (rad replaced 2 years ago) and still it is boiling over into the expansion bottle. When bled the system to refill with coolant, I left the rad cap off to vent any air locks and noticed air bubbles coming through the filler cap, but thought that this was just the system venting any air, however the air bubbles do not stop!!! Once the engine has been running for about an hour the temp gauge slowly begins to rise and I have to stop to let it cool and then refill. I notice that the expansion bottle is filling at his stage. I have had a TK and pressure test and been told that the cylinder head is fine and is not getting any exhaust gasses in the coolant. The rad is also not losing any pressure as it was tested 20% past its operating pressure with normal results. Can anybody PLEASE give me the benefit of their experience as I am now at a loss to explain how or why ANY gas would be in the cooling system after I refill.

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Just a guess but I think their diagnosis was that the head and head gasket was not leaking and not a source of the bubbles you spoke of.
Usually when the head or head gasket is leaking, a unusual amount of water will will be expelled from the tail pipe.

Posted on Jan 19, 2013

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I would check valve clearences bro.

Posted on Mar 06, 2014

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Posted on Jan 02, 2017

stormbrewin
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SOURCE: Coolant filling up overflow bottle

You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.

Posted on Oct 30, 2008

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1 Answer

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2. The water pump may be on its last legs and require replacing. If the pump has failed (and they do) the coolant will not circulate through the engine and radiator as it is designed to do and it will overheat quite quickly.

3. There could be a build up of debris in the cooling system that is impairing coolant flow through the engine. This can occur if the cooling system is not fully flushed out every 2 years and the coolant replaced. The cooling system must then be bled to remove all air. When replacing the coolant you MUST use the correct product as specified by the manufacturer and in the correct mix.

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Don't forget to rate, thanks ;)

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