I just did mine this winter. On the 99 you can do it without removing the dash. You remove the plastic panel, and you will see the band clamps holding the metal tubes to the core. Loosen them and the core slides out. This took about 15 minutes. Putting it back in took much longer. I tried to do it without cutting the tubes, but I couldnt get them lined up, and to stay lined up while I tightened the clamps. So I ended up cutting the tubes 3/4 of an inch from the end and attaching the short end to the core and using a piece of rubber hose to attach the long end. A couple of hose clamps and it was good to go.