[kellyinkc]

So I changed the t-stat and put a new cap on. The temp gauge STILL is swaying although not as wildly. The recovery bottle is still not hot but kinda warm. Restricted radiator? System hold pressure.

 

[KhanTyranitar]

What brand thermostat did you use? I would suspect that the radiator may be plugged, or that air may be trapped in the system. You could also have a weak water pump.

 

[kellyinkc]

MC, I think I got it, burped the system. Car runs better too now that the temp is right.
Thanks.