I am having to top the reservoir almost daily, I cannot se any external water leaks from the engine or rad. I notice also that when I take the cap off the res to top up there appears to be no pressure when the cap is removed.
I have found a slight leak, what a relief thought it may have been something terminal.
Cool, glad you found it. In the future don't forget to post the model and year of your car. Also a trick for tracking down coolant leaks, go to a junkyard and get a resivoir cap, drill a hole in it and fit a tire valve (you can get these at any autoparts place), I just drill a hole the right size, stuff it in from the underside then dab a bit of silicone caulk to seal it. Now fill up the system and connect a tire pump and pump it up to 5 or 6 psi, the leak will become much more apparent.
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