I had problems with my zx of it over heating after about half an hour running. So i changed the thermostat, radiator, water pump, head temp. sensor and i thought the problem was gone. Now the car is running pretty good but when i get stuck at lights for a while the temp. starts going up but goes back down once i start driving again. Also theres a ticking coming from the valve cover and it seems like it gets louder as the engine gets to operating temps. Really need to get this fixed soon so any input is great.. Thanks!