every experienced Prius owner. I am new to the family and encounter issue after 2 month of ownership. I replaced the radiator and try coolant up. But it keeps having bubble came out from the return pipe of the reservoir tank, and also heater blew cold, the temp light came on while drive on high way. I can hear thing ticking from time to time around the EGR heat exchanger area(not sure if it is from that part) like a metal chip open and close. Fortunately the engine oil is still clear brown and no milky texture detected after a week of driving testing. the exhaust does have a bit a water came out but nothing major. Please any insight would very helpful!!! PS： The radiator was replaced because it has leakage due to ran over rock and stuff in a big snow day.