I have a '97 Wrangler. I have 4 wheel drive, but no cruise control, or really any other extra featurs. It is an automatic transmission 6 cylender. My heat / air conditioning will not rerout through the vents, and is stuck in the defrost position. After reading several posts, it sounds like I need to look under the hood for a vacuum leak. I have a few questions about the vacuum system.
1. Where should I look for the leak?
2. Which systems run off of the vacuum system?
3. What are some tell tale signs of a vacuum system problem?
4. How does the vacuum system work?
I'm fairly mechanically inclined, but I'm definitely no expert. I would really appreciate it if somebody could answer these questions for me as though they were teaching somebody who needed to be spoon fed. Also, any photographs would be very much appreciated.
Thank you! You guys are great!