99 eclipse 2.0 turbo never overheated before... Symptoms.. A/C stopped working, minutes later temperature gauge went all the way up, valve tapping, stopped and let cool down... about 1 gallon coolent boiled out overflow. NO leaks, fans work, belts in tack. What next.... How do I tell if water pump, thermostat, or????? HELP appreciated ASAP... Thanks, Ed