When I unscrew it, it looks like a large air valve like on a tire or something.
9 Likes
probably the Ac lines
8 Likes
That’s definitely the high pressure point for the AC. The low pressure would be back near the firewall and where the turbo should have gone
7 Likes
High side a/c pressure port. Usually we do connect pressure gauge hoses to this(and the low side port) for diagnose and service the air conditioning system.
6 Likes
A/C connections, don’t touch that 
5 Likes
Don’t touch that. 
It’s oil for the dual byfriculator. 1000 bucks an ounce. It’s the brand new r134.
4 Likes
I had to swap a whole new turbo encabulator the last time I touched it so yeah best not to
wish hd seen this much earlier
3 Likes
High pressure AC port. keeps your hands off it unless it’s broken.
1 Like
just make a refill and you’re good to go