Our Community is 940,000 Strong. Join Us.


97' blazer 4 wheel drive light


supermann236
10-19-2007, 09:15 AM
Anyone know why my 4 wheel drive light will just come on? Usually happens after getting on the highway, but not reall often. I think mostly When enige isnt at operating temp yet and when there is low vaccum supplied to things other than engine (for some reason I dont have a vaccum reservior). The 4HI light will just come on, it doesnt engage. All I do it push the 2 wheel drive button and it goes off. The sytem works fine otherwise. If I push the 4HI button everything engages like it is suppose to. Im thinking it has something to do with the vaccum, but Im not positive. Any ideas will be appreciated.

MT-2500
10-20-2007, 08:41 AM
When light comes on does the front Axel lock in?
You might check for transfer case codes.

supermann236
11-01-2007, 08:01 AM
I dont believe it does. There is no noise or clunking. The light will flicker a bit and then come on. Seems like it only happens when it is cool outside, and when the engine is warm. To check for Transfer case codes- is that grounding pin 13 or is there another way to do that?

MT-2500
11-01-2007, 08:15 AM
Depends on what transfer case you have.
There is a ID tag on back of transfer case.
Does your 4W shift buttons have a 4W auto mode/button?
MT

supermann236
11-05-2007, 09:53 AM
No its just 4Hi or 4Lo.....no auto.

MT-2500
11-05-2007, 10:16 AM
No its just 4Hi or 4Lo.....no auto.
That one you need to.
Ground pin 13 and turn key on and read codes.
Watch the shift button lights.
They only set 4 codes code =1-2-3-4.
If any codes post back code no.
MT

Add your comment to this topic!