I have a 1995 Blazer 4wd 4.3 v6....My 4wd seems to be malfunctioning...I'm not really sure where to start because its a pretty complicated problem...First of all I know its not the actuator under the battery...I checked it and it's fine...second, I know its not the vac switch on top of the transfer case...I replaced that already...so here's whats going on...First, sometimes when I start the car the light for 2wd does not turn on for a few minutes...I found that weird, second, when the 4lo button is pressed the car will go into 4lo, but it doesn't seem to want to go into 4hi..also sometimes both the 4lo and 4hi lights are lit on the switch, and some other times i get the "blink blink blink" then nothing...as I said it goes from 2wd to 4lo no problem but 4hi isn't working....any suggestions...thanks