Gus he is talking about a 50* swing back and forth.. He should have a 195* thermostat in there and the temp should NEVER go below that when running. I have seen 220* in a wrangler before but it was under fairly hot circumstances. After reving the engine a bit the temp came back to 200* or so and all was well.
Big JIm
Ps Saturday Tony Stewart ran his race car for 40 1-1/2 mile laps at 180mph with a temp of 275* and spewing steam... Pulled something off of the radiator and the temp went back to 230* and he ran the rest of the race with no problem.
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />