This is suppose to be a very serious problem U.S. wide. My mechanic stated that he sees three vehicles a week with the same problem as mine or worse. My water pump went out on my 99 grand am. That Dex-cool that is orange and never has to be changed in 150,000 miles is the culprit. It (dex-cool) eats rubber, plastic, heating cores, plastic fan blades and turns into a thick sandy mess. I had to have my antifreeze replaced with ole faithful GREEN stuff and the old dex-cool flushed out of there. If you don't believe me go to dex-cool website and see all of the complaints and class action suits pending. If any of you have that orange stuff in your vehicle I would do a little research on it to do some PM before it gets in your wallet!!