I note that various people have commented on the possibiity of a clogged system but nobody commented on my "reverse flush" suggestion. This can be a very effective short to medium term cure where appropriate. M= y DIY version approximates the real thing and is easy enough to do to be wort= h trying. I've personally used the system with success on several cars. Long ago in Australia we used service station free-air to occasionally assist with reverse flushing an old Ford Falcon that otherwise wouldn't have made it through a typically baking hot Australian-summer longish distance road trip= .. Back then the Oz speed limit was mostly 100 kph. Probably still is. North o= f Sydney the Princess highway allowed 100 kph and a good clear run. At the fa= r end all the service stations sport "Radiators Reverse Flushed" signs. Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .