Hey guys, did a lot of testing last year on different fans, stats, etc trying to find the best combo and I accidentally found out some more. I have a seeping head gasket and my water level fell about three inches low and my temp went up about ten degrees. I figure this was not using about two rows of tubes so a good guess would be about 5 degrees per row of cooling tubes.

 

Not really a scientific measurement if you had a blown head gasket. That alone can make it run hotter. A good running car 3 inches low on water should run the same temp. The radiator just has to work a little harder.