Hi, First time here, I'm trying to help out a friend with his car. He has a 1994 GMC 4x4 Jimmy 4dr.auto trans, switch on fly. The problem is this.When driving and go to engage 4WD, you push a button on the dash and it supposed to light up, but it does not. If you stop the truck in neutral(dash button for 4wd) will flash on and then you hear click noise like it engaged, again the light on the dash flashes then goes out and nothing happens.The 4wd. Low works fine.
Last year he had the same problem in the cold winter months, 4WD did not engage. In the summer,the 4WD would work and engage no problem all summer. Cold definitely has a bearing on it somewhere. If anyone has had a similar problem or any help let me know here. Thanks in advance