My mechanic could not find the leak. The antifreeze is running clear in the reservoir and radiator. I put the van on ramps and took a look for myself. This doesn't seem to make a lot of sense, but I can clearly see antifreeze coming from the oil pan gasket just above the drain. - I dried the gasket with the paper towel and indeed, the antifreeze is coming from the oil pan gasket. How can this be? - Comments and suggestions are appreciated. Thanks!