[2000blazerls]

No this is not normal. You should have it checked out. Could be a malfunction in the 4wd system itself or a faulty switch. If you have access to a scanner you might want to check for codes. There are a few auto parts stores that scan for free if you dont. Get the codes and look them up and see what the issue really is. I know this is kind of old but this forum is DEAD so I figured I would answer it anyway!!!!!!!!