Hey everybody. I'm really hoping somebody can help me. So I bought does not need legacy, and was told of the head gasket needs to be replaced. First thing I noticed there was no coolant in the oil and oil in the coolant. Both were clean and spotless. When I drove the car it drove beautifully! None of the normal signs of a head gasket that I know of from more domestic vehicles. Eventually the temperature will redline. The first time I did this I pulled over right away popped the hood but there was no overheating! I got back him I kept driving. The next time the temperature gage redlined I just kept driving. Within 10 seconds of it redlining the temperature gage would drop back down to normal. It does this over and over again. I do not see any bubbling in the reservoir tank. I replaced the thermostat with an OEM thermostat. But it still has the problem. When the temperature gauge drops from the redline to normal it takes a matter of seconds. One thing I have not done is tried to replace the radiator cap.
Any help on this would be greatly appreciated!