I have a 2007 Grand Carvan SE, after I drive on the interstate for more than 30 minutes at speeds of 60-70 mph, the engine has a "whine", can anyone tell me what may be causing this whine? Once I get off the interstate and drive at slower speeds it goes away. I don't know if it is something in the engine or is more of a fan belt issue.

Has anyone else experienced this and what was the cause and remedey?

Thanks

 

sounds like a vacum leak

 

Could be the power steering reservoir filter. Ours was working fine until one particular long trip we went on. As it heated up, and at highway speeds, the whine became very prominent. I checked the PS fluid reservoir and there were bubbles in it.

Once we stopped for lunch and it cooled down it stopped and was OK the rest of the way home. I had the fluid flushed the following week and the filter cleaned. Fixed it right up.

That could be your problem.

 

The power steering reservoir filter can be come clogged and the pump cannot get enough fluid and it will cavitate and cause the whine.

The reservoir can be replaced or cleaned. It will need to be removed. Use a turkey baster to empty as much fluid as you can but be careful and do not puncture the filter which is a nylon mesh in the bottom. The two hoses need to be removed and you need several rags to catch some fluid that will drain when the bottom and larger hose is taken off. On my '04 there is a 10mm (IIRC) bolt that must me loosened from the back side underneath the reservoir.

I used carberator cleaner to clean the filter. Make sure it is dry before reinstalling.

 

In my car it's usually my girlfriend.