Wait il ur car is cold like in the am. Take off the radiator cap, start you car and let it idle til the fan comes on. watch as it warms up you'll see bubbles popping up thats the air leaving the system. its free so if thats not the problem atleast it did'nt cost much. If you check old threads someone posted a link about it if you need a visual refference. I think it is the sensor I mentioned before it does'nt look hard in my bay but mines short on accessories n clutter lol. For the link just thread search bleed the coolant system on a integra