I was trying to locate the low-side pressure port in order to recharge my A/C and I think I found it next to the radiator BUT also noticed a hose that is not connected and I am wondering what it was.

Could anybody tell me if #1 what I am showing in the pictures is the low-side pressure port to re-charge my A/C and #2 what is that hose or where it is supposed to be connected to? THANKS IN ADVANCE!!!

Vehicle: 2001 Audi TT Coupe 1.8T AWD

Valve & Hose view


Another view of the hose

 

I just found out that the valve/port in the picture is the actual lowside pressure port. So thats 1 question less.

I still dont know what that hose is and if its supposed to be like that. Anybody?

 

Damn, and I thought I knew this car... Its hard to tell where this pics is. Other than the alternator.. The hose looks dry on the inside. I suggest popping the hood and following it. Its gotta go somewhere.

edit: It almost looks like a PCV or SAI hose..

 

im gonna take a few more pics tomorrow and also follow where it goes bellow the car.. update soon!

thanks for replying!

 

Ok so I did some Google picture research and apparently its the SAI hose. I am no mechanic and I have no idea what in the hell sai or pcv or those terms mean...

All i can say its i just got the car a few weeks ago and it has a cone type air filter, apparently the catalytic converter was changed/replaced/removed, it has an aftermarket exhaust and carbon fiber hood.

Every time i rev the car up to 6-7rpm i get the ABS and EPS light on and after turning the car off and back on they go away.

Also once in a while I get check engine light on and it says something about the catalytic sensor using the VAG-COM but when I took it to autozone it dropped P-0170 (fuel trim malfunction bank 1). To be honest, the car drives just GREAT, no loss of power or misfires, so I dont know why those codes...

Maybe they were messing with stuff like the SAI hose and I also noticed a 2 wire pink connector that's unplugged next to the battery in front of the air filter, almost like above the drivers front wheel. No idea WTF that connector is!

Anyway, so, if that is the SAI hose, is it supposed to be like that? exposed on that end? or is it supposed to have a filter, cap or be connected somewhere? Im lost! lol

thanks!