2000 OBW, 136k, was running fine before doing head gasket just leaked a lot of oil. New water pump, timing belt and tensioners 6 years ago (25k miles). Car runs fine post surgery, but now the temp gauge does not move from cold, not even a little. Fans come on at 203 degrees but temp continues to rise as per odb2 sensor. Heater hose at firewall on pass side gets warm, on driver's side stays cold. Radiator hose at bottom is cold, at top is warm. Temp got to 233 in a hurry. Stumped. There's only one temp sensor, I think, and it turns on the fans, but gauge not working. I've done the burping thing but can't do it long as it gets hot quickly. Now what?