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There is a relay on the passenger side under the dash that operates the fan. Most of the time this relay causes the fan to quit working or work intermittently. Sometimes you can bump the dash next to the glove box and the fan will start.
I not sure if I fully understand your question. Are you asking should your car be bouncing more when you hit a bump or pot hole?
Well this is how struts and shocks are suppose to work: Struts and shocks are suppose to assist in providing a smooth ride, when you hit a bump or pot hole the struts and shocks absorb the force so you won't feel the full impact when driving. A good set of struts and shocks will eliminate excessive bouncing when driving or when you come across bumps and other mishaps in the road. So inconclusion if your car is not doing a whole lot of bouncing when you are driving that is a good thing, because that means your struts and shocks are doing their job and that means there is nothing wrong with them.
This sounds like a broken or loose motor mount. Has any work been done recently on the van? I am wondering if someone did not properly tighten or attach an engine or transmission mount. Turning or hitting a bump could cause the engine to shift if not secured at the mounts, resulting in the symptoms you describe. Carefully check around the fan at the front of the van (off, NOT running) for evidence of contact being made with the fan shroud or anything else nearby. The noise you hear could be the fan making contact with something when the motor moves when turning or going over a bump. The other possibility would be a bad axle, but that is usually evident when turning, not going over a bump. Have this checked asap, as it sounds like it is dangerous to drive, and can cause more damage if not repaired. Let me know what you find. Good luck.
This usually indicates a problem with the suspension components. Check for play in front end suspension, 1st thing I would check would be the steering damper, it's often overlooked, and could be the cause. If that checks out ok, jack up and check for play in wheels, which could be caused by worn ball joints, tie rod ends, wheel bearings. A lot of possibilities, generally play in any components can trigger the shaking you're experiencing when hitting a pot hole or bump. Good luck!