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The 4x4 system on a 2003 is not vacuum controlled.
You can find an engine diagram in your owners manual for your 1997 4 cylinder Jeep Wrangler. If you no longer have a copy of your owners manual, you can contact Jeep, and they will send you a new one.
2003 honda rancher vaccume diagram
You can find a free 2003 Chevrolet Express Van V-6 vacuum diagram at most Chevrolet dealerships. You can also find the diagram at most libraries.
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Yes they all do, yours is in the fuel tank.
repair manual ( available at your auto store) for around $20. Jeep wrangler 1987 through 2003 all models
Vacuum lines on the 2003 Chevy Silverado 2500 heavy duty pickup truck. A diagram of the entire vacuum line system can be obtained from most Chevrolet dealerships.
A Jeep Wrangler has one spark plug per cylinder.
i do have the picture for this diagram but i can not posted if you nned ut mail me and i will send it to you .....paulcastillo25@yahoo.com
It's a vacuum leak somewhere in the system. There are several vacuum lines that operate the blend doors on the system. If there is a leak where the system will not hold vacuum, it will default to defrost automatically.
most likely has a closed crank case ventalation ccv