[1998 legacy random temperature gage fluctuations]

With your thermostat was exactly the same as the one from Subaru I put in. When the car is running normally the temperature isn't all that hot coming out of the vents. But eventually it gets really hot once it starts overheating.

[1998 legacy random temperature gage fluctuations]

I just changed the thermostat today. This morning precisely. I will run it again tomorrow and see if I can bleed the system more but I thought I got it all out. I didn't check the back rad hose. I will be there in the morning. I did not change the rad cap but I will try that too.

[1998 legacy random temperature gage fluctuations]

There's no bubbles in the tank. The temperature coming out of the vents isn't hot but it isn't cold. It obviously gets really hot once the temperature gets up. The fans come on normally.

[1998 legacy random temperature gage fluctuations]

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!