Our trusty old Ford Fusion (2003 - 1.6 petrol engine) has been leaking coolant for a couple of years now, and we simply top it up every week or two with about 100 ml of coolant. The coolant drips from the bottom of the engine sump, but seems to be coming from higher up somewhere behind the AC compressor. I spent some time today looking for the source, taking out the right hand headlamp for better access. Unfortunately, the alternator and the AC compressor are in the way, but I think the leak must be coming from the point where the thermostat is mounted on the engine. I can feel that connections of the two hoses to the thermostat are not leaking. If am thinking this is probably beyond my capabilities as (according to Haynes) I would have to cut (and renew) the aux belts in order to remove the alternator to then access the thermostat and renew the seal (if my assumption about the source of the leak is correct). The cost of garage hours is really not an option for us at the moment. So I wondered whether it would be best to carry on as before with the topping up, or try some "leak sealing" product. Any thoughts or suggestions would be welcome - many thanks.