You are obviously overheating. The water temp in the overflow bottle is meaningless. Normally the water will expand into the bottle when it heats up, prob. about 150-160*, then sit there cooling to ambient temp unril the engine shuts off and the water is drawn back into the radiator. Rather than YOU pulling the radiator I recommened first "back-flushing the cooling system", (Google it), to clean the entire system including the block. Your gauge should never red-line under any circumstances.