I have an antifreeze leak in my 1999 chevy silverado. I have looked underneath for a trail and under the hood for one. I checked the oil to see if there was any kind of milky look to it or if any water came out with it and no luck. it has been about a year since it started and just recently has it started to get worse but i still cant find any clues to where it is leaking. Someone suggested a sealant you put in your system and others say that it will just clog pumps and cause more problems. any ideas?