Hi, hope this help. If you want to inspect where is the leak point, do the following steps:
1. Park your Caravan at a flat area and apply the handbrake. Switch off the engine and let it cool down for a while. Open the front hood and locate the power steering system. The power steering utilize hydraulic fluid to transfer the power from the pump to the rack & pinion, so you can easily spot the Power Steering refill tank with the cap stated "Power Steering Fluid".

2. Use a clean cloth to clean the dirt or any leaking fluid around the steering system.

3. Start your engine and turn your steering from left to right and right to left, do it a few times. Turn off the engine and inspect the steering system see if you can spot where the leak come from. Use a torchlight for a better view.

4. Check if the power steering pump and refill tank is crack. If you found crack, it must be replace with a new one. Look around the power steering fluid hose and connection point, if there are loose or crack, replace it or let your mechanic do the job.

5. If you can't find any leak, better call your mechanic and ask them to tow your Caravan to the workshop. Don't drive your car because if the power steering fluid continue to leak, the hydraulic pump will lose its power and your steering will become heavier in time. If you rotate your steering by force, it may damage your power steering system.
Source(s):
http://www.2carpros.com/first_things/power_steering.htm
http://www.ehow.com/how_4814260_fix-power-steering-leak.html
http://www.ehow.com/about_5143748_problems-low-power-steering-fluid.html


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