Re: Water under car
might just pay to keep an eye in the temperature gauge from time to time.
One can do a couple of quick checks. on the hoses is there a wet bit when feeling around them or a mark of antifreeze showing.
Bottom of radiator may be rusting away have you looked or the air flow fins in the rad partially blocked
Pressure cap may be failing
it might just be the hoses feeding the heating system
are weeping engine side of the bulkhead
When removing the radiator cap if is there any white stuff in it, sure sign of air getting in.
The thermostat may be sticking. this can be checked by removing and putting in a bowl of hot water to see if it fully expands.
The plastic overflow container needs examining for any weakness on the sides/ bottom
Has the water level when cold altered
yes of course the air con will expel water as will a cold engine from the exhaust until warm.
Also is the air cold when on, it should be run every so often so the seals don't dry out, if warm then they have and need replacing
Another cause may be, strange as it may seem the vents under the wiper blades drain pipes blocked or even the roof channels ,if the car has them the drain holes get blocked
As there are several possabilities when asking questions of this nature you need to be far more precise.
Such as where under the car are you finding the wet patch, have you only noticed it after it has rained, may be just rain from the underside of the car falling off.
Is your car on the level when parked, if on a slope that could mislead any investigation.
One thing you can ask a garage to do is a pressure test on the water system. that would instantly show up any leaks
maybe time for a major service by a really good Ford garage, we have our cars serviced by a main dealer every year