hi
not 100% sure if it is the head gasket yet, as she's not running warm, is building up alot of pressure in the header tank and water wee bit foamy and dirty. water leek when stopped but unsure where it coming from, running down the front of the block and dripping from around the bottom pulley area, thinkin water pump or thermostat housing. any idea's? could it be the water pump or thermostat housing cracked? or is it the head gasket?

cheers