hi I am new to this forum
I am having a vacuum issues with my 02 chevy blazer ls. There is no vacuum getting to my 4wd actuator. I have already replaced the TC motor. Checked and replaced vacuum lines. Installed new cable to differential
also replaced TC vacuum switch. I can hear clicking sound from TCCM. I was wondering
is there a vacuum solenoid switch somewhere?
Or is there a bigger problem going on?
I forgot to mention I have a 4.3 vortex engine
and have 3 switches on dash
2w hi. 4w hi and 4w lo
any help to resolve this problem is appreciated
I am vacuumed out of ideas

 

Are you getting vacuum TO the TC vacuum switch? Also, is the vacuum line plugged into the accumulator in the driver's side fender? If so, it might be time to tear down the passenger side axle and tear into the front dif to find out if that is the problem.

 

thank you AJ
I was hoping it wasn't in the diff
I will double check for vacuum
i will keep you informed
hoping for a oversight

 

Could be something as simple as not connecting the three hoses to the TC vacuum switch correctly also.

 

Have you tried to manually engage the 4x4 by hand.....I would try this as if you get to engage then good news is that it's not your front diff....funny thing is I took out my actuator today and found a tiny tear causing me my non engaging 4x4