I have a 2002 Blazer and as of recent i discovered that my front wheels were not engaging. At the same time my floor heating vents were not working either. Last night i attempted to replace the 4wd actuator located under the battery. When installing the actuator i happened to drive air through the vacuum lines and I could hear a leak. Does anyone have and ideas as to how locate the leak, or a diagram so that I could trace the lines and hopefully find the leak on my own?

 

3-button or 4-button?

Check the vacuum lines over near the brake booster. One should run into a plastic panel that is mounted on the fender. This is your vacuum reservoir.

 

I have the three button 2 hi, 4 hi , 4 lo NO auto I forgot to mention that when i blew air through the line the leak sounded as if it was back near the distributor cap.

 

This would be where the main vacuum supply for the HVAC and 4wd originates. Look for a loose line back there as well as an open vacuum port.

 

How would I go about acessing this port? What pieces would I need to take off? Also, someone told me if I took off the distributor cap my engine would need to be retimed is this true?

 

There are two vacuum ports coming off of the Back of the intake, one is for the brake booster, the other is for vacuum accessories, you probably blew the hose off of them...

 

I have no heat in my 1999 Chevy blazer I think I have my 3/8 vacuum lines ran wrong ive just flushed out my heater lines and radiator and had heat again for a day but was still messIng around with the vacuum lines bc it's jus blasting air out the front vents I dont have control to change to defrosters or floor and now today I found out I don't have heat again. Just a vacuum line diagram for under the hood would be a great help there impossible to find.