A/C Compressor Won't Kick On

A line goes from the manifold to the vaccum canister. One of the lines from the firewall goes from the vaccum canister and the other line from the firewall goes to a vacuum heater valve on your heater hose. I do not know which hose is which on your car but if the two hoses are different sizes the bigger of the two is the feed line from the vacuum canister and the smaller of the two goes to the heater control valve.

Chuck