AboutDavid Hill Expertise I can answer questions concerning automotive air conditioning systems, residential air conditioning systems and electrical repair questions.
Experience I have 16 years of experience in the automotive air conditioning arena and am currently an instructor for H.V.A.C.
Education/Credentials I am certified through as a universal technician under sections 608 and 609 of the C.A.A.
Expert: David Hill Date: 6/29/2008 Subject: HEATER CORE
Question HOW DOW I REPLACE A HEATER CORE FOR A 2000 FORD EXPIDITION OR CAN I BYPASS IT IF SO HOW DO I DO THAT.
Answer Isaac,
I feel for you. I have a 99 expedition, and for almost 200,000 miles, I have put about 300 bucks into it for parts. Love the truck. But the job you have ahead of you I do not want to do again. If you want to bypass it, it is possible, but come winter time you will regret the decision. That is as easy as taking two rubber hoses, and rerouting the coolant flowing through the lines heading into the cab of the truck. Take a rubber coolant hose, I can't remember for certain, but I believe they are 1" lines and connect the two lines flowing to the heater core in the engine compartment together. The do the same to the lines coming out of the firewall. That will completely bypass the heater core. But again I discourage you from doing this. Not only will you freeze in the winter, but it may also affect your engine operating temperature slightly.
Now to do it right... I have a subscription to chilton's online, and I am going to copy and past their instructions here, simply becasue it is fairly in-depth for me to sit and type. I am sorry but this website does not have the capability for me to do the pictures also. If you send me an email address, I'll see if I can send you those also. But make sure you post that one as private, so it isn't out there for the world to see. I would hate to get blamed for you getting a bunch of spam mail. LOL. Anywyas, I forewarn you... you have a pretty good job ahead of you.
1.Remove the instrument panel.
2.If equipped with the 5.4L 4V engine, remove the junction block splash shield.
3.If equipped with the 5.4L 4V engine, remove the bolts and disconnect the cable ends from the starter relay.
4.If equipped with the 5.4L 4V engine, remove the junction block bracket.
5.Disconnect the heater core hose couplings.
6.Remove the retaining screw and remove the A/C plenum demister adapter.
7.Disconnect the vacuum line from the A/C plenum demister adapter.
8.Remove the heater core bracket.
9.Remove the 13 plenum chamber top retaining screws.
