My neighbor has a 2003 Dodge 2500 4x4. She asked me today if I could come over because her battery was drained enough that the truck wouldn't start. When I got there and opened the hood I saw the upper radiator hose was collapsed. Knowing this was not a good sign I took off the radiator cap and the anti freeze was gelled ! I have never seen or even heard of anti freeze gelling, and I live where it's cold ! It doesn't appear that the entire system is gelled, but I will get a better look tomorrow. It was just serviced after Christmas and got new radiator hoses, she supplied the shop with the Zerex GO5 anti freeze. So, I am pretty stumped on what actually happened to make it do this. The old anti freeze (before the work) was Zerex GO5. I know because I buy it for her with my AutoZone discount (trying to save her a couple bucks).