"The hot water check valve line runs into the firewall..it goes to the port closet to the passenger side. The main vacuum hose from the engine runs across to the canister behind the battery. There are two check valves in the main line. 1st check valve is close to the engine and its just a straight valve and the other check valve is close by the computer and has a tee built in it. The tee part runs down to the only and last port running into the firewall and there you have. Air and heat coming out the vents or defrost when you command"
Someone else did the hard work for me. Good luck.
SOURCE: diagram bypass heater cord on 2001 ford expedition eddie bauer
the heater bypass is quite simple, if you look at the firewall you will see two medium sized coolant lines, remove them from the firewall and link them together using a proper sized tube, you can purchase a kit at a parts store quite cheaply
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