Anyone ever have to remove the oil cooler on your van? I need to replace a leaky o-ring and don't see any bolts to loosen. Please help. A link to the part I am talking about is below.

http://www.amazon.com/ACDelco-24504105-Oil-Cooler/dp/B000C9O852

I did the same repair on my 97 Venture and I would assume yours would be the same. The cooler is held in place by a long threaded nipple that runs through the center and into the block. That's why you can't see any bolts on the outside. It is the same piece that the filter threads onto. When you remove the filter you will see a hex shape flange, which will allow you to remove it with a socket, or even by hand if it's as loose as mine was (the reason it started leaking in the first place.) Clean the threads on the block and the nipple really good and use thread locker when reassembling so that servicing the filter does not cause the nipple the come loose again. When you change the oil just make sure it's remaining tight before putting the filter back on. Good luck.
Mike