metallic ringing noise from behind engine, only known part there is the water pump, also the temp gauge rises to almost 3/4 way to hot then drops back down to half. It's like the thermostat is sticking closed and then finally opening after sometime. Another thing the car is drawing in ambient air from somewhere on the belt side of the engine, i hear a hissing when the engine is running but i cannot pinpoint the where its coming from.