Vacuum line diagram
 

I have an 2000 blazer 4dr 4wd that i notice a have a vacuum line disconnected on the driver side running to the inner fender. Im not sure how it connect. My friend was trouble shooting the heating system last winter because i had no heat. After he done some unplugging it work for a lil bit, then it didn't. He took a section off and i didn't see where and how it went. So i was wondering if any one had and diagram on how they all went.

Your mystery line going into the inner fender goes to a vacuum reservoir ball. I don't have a diagram but this is your vacuum system: starting at the source on the motor under the plastic intake duct the line goes to a T-fitting, the line off that goes to the vacuum switch on the AIR pump. Other line goes over the master cylinder -inline check valve- connects to a T. Line off that goes to 4WD actuator solenoid, other line goes to another T. Off that T, one line goes to your heater controls, other line goes to the reservoir in the fender.

Thanks, is there a way maybe you could post a picture of your or something because I am having trouble following. I also don't know what tee connector to use maybe you have a pic of them and I also think I'm going to change the hoses out what kind should I use. I see one line goes into my firewall if I'm not mistaking is this right?

vacuum
 

i noticed that on mine too.

how do you follow the line of the (T) that is hidden in the drivers side fenderwall ????