need some ideas of what to check for a leak. the coolant leak in located on the passenger side next to the exhaust manifold. it will increase in rate with the heater running. it is not the hoses from the heater core. no discoloring of the engine oil and no smoke out of the tailpipe. any suggestions???? i have included an image of where the leak is. in the image the leak is by the arrow that number 5 is pointing to.