air conditioning low pressure side

[mastershake]

ok so ive searched the location of the low side port on the 3400 and found out its behind the alternator kind of low by the firewall and it has a blue cap. so im searching all over for this little peice of shit and i cant find it anywhere.. but then i start to wonder if its this little peice of metal, and the cap is missing?


edit. just looked at my friends 3400 and confirmed that's the location and indeed my cap is missing. EFF MY LIFE.

is there anywhere i can buy a replacement cap? im pretty sure my whole a/c system is going to be effed from the cap being off for so long...