I own a 1992 Explorer 4x4 XL. I have noticed a slight dripping of antifreeze under the truck after I have driven it. My mechanic has not been able to locate the leak. He said to keep an eye one my fluid level and once it got a little worse that he should be able to find and fix the leak. My question: How do I know if I have plenty of antifreeze? (I have never fooled with the antifreeze before) Can I just make sure there is antifreeze in the tank located beside my washer fluid tank? How do I add antifreeze (mix water and antifreeze or straight antifreeze)? Thanks for any help.