Topping up with coolant almost daily, yet no apparent leaks. When engine turned on there is a surge of condensation on windscreen which is particularly present when heating turned up. Any suggestions?

Check that the thermostat is opening properly. Also are you sure your topping up the overflow or radiator and not the windscreen washer bottle.

Have you checked your coolant level? souns like you may have a heater core leak.

A lot depends on where the leak originated. If it's the water pump, it will only get worse, circulation will be impaired, engine can easily overheat...won't ;last long.
If it's an external leak, and you don't let the coolant get too low, it can go a l;ong time, with daily or regular topping up of the radiator.
If it's a blown head gasket and leaking internally, its days are definitely numbered. If its a head gasket and leaking externally, a little safer, but iffy: the head gasket may keep eroding and the leak get bigger. Overheating of the engine may occur.

There is water from condensation from the a/c system that will drip onto your exhaust manifold when you turn the engine off after running the a/c for a while. Check coolant level daily when your engine is cold and if it isn't dropping then it is just the water from the cold a/c.

must be burning it,might be not burning enough to notice from the smoke...

Sounds like air in cooling system. Coolant comes through to back of glove box area for your heat supply.
Have you noticed less available heat than normal?

Check the coolant level in radiator, not just the top up bottle. DO THIS WHEN ENGINE IS COLD as hot system is under pressure.

Possibility of head gasket leak suppling gases to coolant system. IF so may be producing some persistant heavy white steamy exhaust, though not necessarily.

Topping up coolant will (should) make noise go away at least temporarily. You should look to see if any obvious leaks or wet spots at hose clamps and heater hose connections.

When engine is cold, open Radiator cap, look down (flash light helps?) to see fluid level, should be full to top.
If not, top up with correct coolant mix, leaving cap off, start motor and allow to idle till warm. If level drops top off some more. Watch the fluid as it flows past cap opening. a few bubbles for a few mins may be normal, but continous stream of bubbles indicate head gasket leak. Turn on the heat in car to full, (not the fan, just heat level) gently rev the engine and top up fluid at same time, (2 people) replace cap. Done. If there are no apparent problems.

If noise returns or does not go away, you'll need a professional inspection.

hi. if your coolant is dropping down, there is a coolant leak on the heater matrix (little heater RADIATOR for heating the car and is usually under the dashboard). DO NOT LET THE COOLANT DROP DOWN AS THIS WILL BLOW THE (HEAD GASGET). please check the water (coolant) level daily, and try to fix this as soon as posible. gerry

sounds like your heater core is leaking

Possible coolant leak on hot engine parts causing it to evaporate as it leaks. That would definitely invade the cabin air. You would need to carefully check under the hood with the engine warmed up and running.

Also could be a headgasket failure between coolant channels and a combustion chamber. This latter problem sometimes shows itself as vapor at the tailpipe after there should be no more visible. You may also detect the odor of coolant there too.