1998 blazer 4 wheel drive
 

i have a 1998 blazer and here is my dilemna. about 2 years ago i had my wheels replaced and for some reason the place i got them done at pushed my 4 low button. i didnt now it and just floored it on the highway. and since then my four wheel drive hasnt' worked. i can here it engage or click when i push the button but the wheels dont lock. any ideas by anyone what could be wrong with it. i am a some what engine savvy. so it is work i would like to do myself. Thanks.

You can start here:
4x4 No Worky.... Maybe this will help....

have you tried putting it in 4wd with the truck in neutral? if not try that