Try 130 instead of 176
'\xB0' is hexa for 176 resp. octal \260. It depends on terminal type and character set. Normally it is 176.Try 248 (\370 or \xF8).If it wont work, print each character. One of them must be correct.
Serial monitor will only print characters with ASCII values from 32 to 126.
exactly where should I add the lines you say.
Serial.print("\260C | ");