I have a 2000 Mustang GT and Im losing a lot of coolant. I recently changed my thermostat so I opened it up to make sure everything is clean and sealed properly. After trying this twice it is still leaking! Its not leaking on the ground but there is a big pool on the block under my alternator. I dont see any visible cracks but my sight is very obstructed. It doesnt always leak but mainly when my cooling system is under a lot of pressure. Regular driving while my thermostat is open isnt bad, but harder driving makes a complete mess of coolant. Im thinking my intake manifold gasket? Please help!