coolant leaking issue

[Guest]

So I have coolant leaking from under intake Manifold, What could it be?

I take off intercooler and pour water into header tank (Car is not running) and you can see a water puddle taking place under intake manifold and making its way down. Refer to photo.

Do I now remove Intake manifold and check for holes? I would need gasket I presume when re-assembling? Any tips on removing would help.

What I have noticed with radiator - Driver’s side gets hot, while the passenger side is cold.

I have checked the following;

No Bubbles, no milky dip-stick, exhaust output normal, heater is working.

8months ago car I did have water leak repaired by Manukau Subaroo and comments were;

‘Pressure Test Cooling system, Found Steel pipes behind cambelt covers leaking, remove cambelt and covers to replace. Reassemble and bleed cooling system. Water pump is fine’.

Should the coolant have gone rusty in this time?

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Brief Story;

Warm up car to go home from work, 2mins into it. Rev & boost gauge needle drops suddenly and Engine Check Light comes on and Radiator Fans switch ON and then both needs go back to normal position. Engine Check light will not go away, but drive and boost is all normal. (Engine did not cut out even though revs went quite low)

Next day turn on car, The Radiator Fans are constantly on Engine Check Light still present.

So I reset ECU, Engine Check Light Goes away. And I have not heard/seen the Radiator fans come on since.

Before I had reset ECU, I did have an Error 21-Engine Coolant temp sensor. I have not checked for error codes since.

2days later, I notice the temp gauge getting higher than normal, There was plenty water in the overflow tank, so I did not bother opening Radiator cap as it was hot and I always thought if water is required engine will suck it from overflow tank as needed?

Next morning I check header tank – bone dry. So I hose out the old rusty coolant with little rusty flakes. Replace with new coolant and bleed than notice puddle under car.

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[Jimbob]

coolant pipe across block or the hose connecting to the ones you got repaired last time

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[rex-leggy]

+1 for crossover pipe . only need 2 o-rings to fix it at about $3 each

[Guest]

 rex-leggy said:

+1 for crossover pipe . only need 2 o-rings to fix it at about $3 each

no need to change crossover pipe? on closer inspection it is quite corroded so i would like to change if its not too hard :-/

[Jimbob]

theres 2 orings that may fail that keep pipe on block. But could also be the smaller cooant pipe that goes to the tank if thats where the rust is coming from

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[rex-leggy]

if you get a pressure tester you'll find out where the leak is coming from .

i still recken the o-rings ..... would take a fair bit of corrosion to eat through the alloy pipe.

but there easy to change, just have to lift the intake and it stares you in the face.

[Jimbob]

yeah remove intake then ya will know where its coming from, and i didnt mean the alloy pipe hehe. just the metal one that runs beside it from top tank to water pump i believe.