Have a 2003 ZX3 16v 2.0L Zetec Focus, and I found a leak of radiator fluid coming from the Drivers side of the engine. There is a Square housing that has 1 hose coming off of the top(approx. 1/2in) and 1 hose coming off the bottom (approx. 1 1/2in.) is this the thermostat housing and if not what might it be? Thank You.