My 2009 Impreza Outback sport has been experiencing some persistent coolant leaks. I am quite new to working on cars so I have come to you all for help! Initially I thought that it was coming from the coolant hoses connected to the throttle body, so I replaced them, replaced the throttle body gasket, and cleaned the throttle body as well. After attempting to drive it I noticed that when the car got hot and up to pressure the leak was still ongoing paired with quite a large amount of coolant loss. I was able to catch a glimpse of the coolant hose that connects to the air intake manifold on the drivers side (about two inches from the throttle body and slightly under the throttle body’s drivers side coolant hose) leaking coolant.

After the engine cooled, I checked out that hose and found that it was absolutely crispy, it had no elasticity to it what so ever. I ordered the part and replaced the hose. Now I’m seeing a coolant leak from that same spot where the hose meets the air intake manifold. I do not have a pressure tester though I will be picking one up shortly. despite this I’m confident that this connection or hose is where the coolant leak is. 

My questions are as follows: what is the hose fitting that screws into the air intake manifold and allows the vacuum hose to mount on it called? 

why does this coolant hose have no clips (doesn’t seem to on diagrams I have seen) and could this be an issue? There were no clips on the initial hose and it obviously ran fine for year. 

Is it possible that its the fitting thats gone bad and not the hose? If so any advice on sourcing and properly replacing it? 

Thank you everyone!

 

you can 'borrow' a coolant pressurizing kit from a parts store. That will help you visualize leaks without risking a burn. If it is a minor dripping on a hard-to-replace part, you cod use some Subaru Coolant Conditioner (ONE bottle only, installed ONLY as directred) and stop or prevent minor leaks.