('01-'02) What is this coolant tube/pipe? - SOLVED! - Subaru Forester Owners Forum
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post #1 of 13 (permalink) Old 06-16-2019, 05:30 PM Thread Starter
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What is this coolant tube/pipe? - SOLVED!

I have a small leak in the pipe that goes to what I think is the heater intake tube. It comes out of the engine block and is secured by one bolt. I can see it dripping when I squeeze the upper radiator (large) hose and then hear it suck in air, which I think is keeping the thermostat from opening.

It is not loose, so I think I will need to replace it, but I dont know what to call the darned thing to look up a replacement part.

Thanks!

Its the metal pipe piece, dripping from where it connects to the engine block.



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post #2 of 13 (permalink) Old 06-16-2019, 05:50 PM Thread Starter
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Okay I think this is part of the "coolant crossover assembly"

Correct?

https://www.subaruparts.com/oem-part...bC1oNC1nYXM%3D

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post #3 of 13 (permalink) Old 06-16-2019, 06:07 PM Thread Starter
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No I have done a bit of searching and I believe it is the "water manifold/ coolant cross over" pipe, as seen here.



The small pipe coming off the right side that goes to the heater intake is leaking, where the main part of this "manifold" attaches to the small pipe that the hose then clamps onto.

I have found a used one but I worry that it is just a gasket between these two parts.
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post #4 of 13 (permalink) Old 06-16-2019, 06:08 PM
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@Foresteeeeer that link you posted is for the "water pipe" that is on the top of the engine. Is that the pipe you're referring to?

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]

'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
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post #5 of 13 (permalink) Old 06-16-2019, 06:10 PM Thread Starter
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Yes, it is on the top of the engine.
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post #6 of 13 (permalink) Old 06-16-2019, 06:14 PM
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Okay... it was difficult to tell from the picture.

Bobby...


['07 FSXT MODding Journal] ['03 X MODding Journal]
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post #7 of 13 (permalink) Old 06-16-2019, 06:14 PM Thread Starter
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Seems to be leaking here, where there is a bolt holding the pipe on the water manifold.



Okay it is not dripping from that joint, it may be the O-ring for the coolant-crossover/water-manifold.
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post #8 of 13 (permalink) Old 06-16-2019, 06:44 PM
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The pipe is simply a press fit and IIRC there is a bolt that holds it in place, no gasket.
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post #9 of 13 (permalink) Old 06-16-2019, 06:47 PM Thread Starter
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I think it is more likely the gasket/o-ring on the water-manifold/coolant crossover. Are they likely to leak once the engine is cooled? I can see where the coolant is flowing out onto the engine block but not quite sure where its coming from.
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post #10 of 13 (permalink) Old 06-16-2019, 06:54 PM
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That water pipe appears to be a PITA to remove... quite the R/R procedure! Perhaps check the torque on those attachment bolts, if you can get to them?

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]


'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
'95 Neon Sport
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post #11 of 13 (permalink) Old 06-16-2019, 07:20 PM Thread Starter
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It is definitely leaving air into the system somewhere, no matter how much we 'burp' the radiator it never stops bubbling. With the engine off, ill squeeze the rad tubes and I can hear it leaking air and coolant, a small hissing/spitting noise right by that gasket.
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post #12 of 13 (permalink) Old 06-16-2019, 07:42 PM Thread Starter
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Okay so one of the bolts holding the water pipe down was broken so it wasnt being held in place correctly.
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post #13 of 13 (permalink) Old 06-16-2019, 08:17 PM
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That's bad... & good, as you know why it was leaking! Is the bolt broken where it screws into the case/block?

I attached the Subaru technical service R/R procedure, just in case you need it.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]
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File Type: pdf MSA5T0122A27602_service procedure_water pipe.pdf (106.6 KB, 15 views)

'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
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  Subaru Forester Owners Forum > Technical Forums and Vehicle Assistance > Engine and Exhaust > Cooling Systems

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