mg zr 160 realy strange coolant leak :/

As title says normaly i can figure out coolant leaks but this one is realy strange :/ basically when the car is on our drive on the hill part it doesn't leak, doesn't seem to leak when on the flat, doesn't leak when jacked up on the passenger side but when the car is jackd up on the drivers side it leaks haha the coolant is making a puddle under the thermostat housing and then running down the engine block and dripping off the sump



from what i can see it isn't coming from cylinder head or inlet manifold (which have just been done bout 100 mile ago) but doesn't feel like it is leaking from the thermostat any ideas would be great



cheers

saul

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