Well I use my ashtray as a change holder in my 96 2 door Blazer LS with 4wd. Lately I've been noticing my change getting very oily. Well today when I went to reach in the ashtray my fingers were covered with what looks like engine oil. Now I am the only one who drives this truck and I service it myself. It hasn't had any service done in about 3 months. This started maybe a month ago. I did a search and nothing... I tried looking up with a flash light and there's a metal plate in the way. Before I start tearing into things. Does anyone know what this could be?

 

first off...what year is it?
have you checked your radiator to see if its low or if perhaps there is oil in it?

 

possibly vacumm switch has gone bad in transfercase and its now pulling trans fluid into the hvac and leaking into the dash.

 

^^^x2

 

x3, this was my first guess.