Originally Posted by EaOutlaw
The one that goes across the firewall may be the line that goes to the vacuum storage canister normally under the washer bottle.
Make sure that's not the water line from the windshield washer bottle to the squirters. Looks similar to a vacuum hose.
In my '97, the vacuum hoses (there are 2, one red and one green) to the vacuum canister is contained within a plastic conduit that also contains the vacuum lead for the EGR valve.