2001 S10 will not go to 4HI 4WD
I have a 2001 S10 4X4 ext. cab, 114000 miles. A few days ago on snowy pavement in drive stopped at a stop sign, pressed button for 4HI, light flashed and went back to 2HI. Next day, in a snowy parking lot, placed truck in park, pressed 4HI, no response. Same thing if you have it in drive. In neutral, if you press 4HI, light blinks, goes back to 2HI. Press 4LO, both 4HI and 4LO lights blink, goes back to 2HI. I can hear th transfer case motor doing something, not for sure what though. GM dealer told me most common item they have seen replace is the vacum switch, runs about $35. I see where someone with a 2002 S10 Blazer is having the exact same problem I'm having. Can anybody offer up any suggestions? Thanks so much!