My rear hatch lock failed during a cold snap a couple of weeks back. (thankfully in the unlocked position) I didn't want to hassle with taking it to the dealer under warranty, so this is what I found.
1. Traced vacuum leak to the hing area of the pass. side hatch.
2. Separated the rubber gasket that goes between hatch and body.
3. Found that they use a yellow PLASTIC hose, and it cracked in half. (very poor design)
4. I used a piece of rubber vacuum line to reconnect the two halves. (due to lack of extra line and other wires I used a pair of needle nose pliers to hold the plastic line while I slid the vacuum hose on.)
5. Reattached rubber gasket.

Total time, about 10 min.

This is most likely what the dealer would anyway, as I cannot see them replacing the whole line, and this will last ! If they did replace the whole line, it would probably break next winter anyway.

Hope this helps.

 

Thanks for the write up. It will happen to many. Maybe the moderator can move this to the fix it area.

 

How did you remove the plastic trim off the hatch?

(Sorry for revoking such an old thread. )