It used to work flawlessly for two years. Now the winter is coming, and I
wanted to test out shift-on-fly 4wd on my Trooper 98. The problem is that
most of the time it will take 2-3 minutes to engage, green light keeps
blinking all the time. Sometimes it kicks in within 5 secs, just like it
used to do all last winter. Mechanic checked the darn thing and can't find
anything wrong, it seems to engage just fine when in garage, and vacuum
sucks as it should.
Any ideas what could be wrong? I'd rather fix it before snow comes.