So today I decided to change my spark plugs (which was much needed after looking at the ones I pulled out), change my fuel filter and flush my coolant. The first 2 procedures went fine...

When I went to take off the cap for the coolant, the piece that it screws into with the tube sticking out of it came off completely, as if the metal just corroded to shit. This explains why no coolant was circulating through the reservoir, because there was no pressure in the system.

Anyway, now it is impossible to keep any coolant in there at all and to fix the problem I have to replace the whole top of the circled area where the cap screws in. At this time my car is non drivable and tomorrow is my girl's baby shower in the Bronx. Naturally...

What is the name of the circled area so I can ask for the right part from Subaru?



Note: This is not a picture of my engine bay, I just used it as a reference.

 

Coolant reservoir cap?

 

thats a coolant tank, like an secondary expansion tank thats connected to the turbo. I actually own an STi and never even noticed that thing :rofl:

they will have a schematic at the parts department you can look at that will tell them the part number...i'd be really suprised if they had that in stock tho

 

The cap is fine and that is not the reservoir. It is the part that I put the coolant into. The section that the cap screws into with the tube coming out of it broke off.

 

thats ABS plastic on my 06, not metal. maybe thats why

 

Yeah but even still, this is very weird to happen.

 

my guess is that you, or a previous owner, used tap water instead of distilled

 

Well, this was my first flush since I got it about 20k miles ago. I did refill it once with 50/50 out of the bottle, but never tap. It's possible that the coolant in there was just old as hell.