I have an 82 gtsi. Yesterday , while poking around in the engine bay, I noticed a loose hose. There is a braided line coming from the left side. There is a small canister attached to it. The cannister is attached to a threaded hard line. The cannister is located just above the accumulator. WHAT IS THIS PART CALLED, AND WHAT DOES IT DO?? This part has rusted out and and needs to be replaced, any help would really be appreciated....Thanks-