If there is Rust around the Block area, there maybe a chance that this car has Head History, check the hoses! are they new? do they look as if the have been moved, on close inspection you will see where they should have been, what service History has it got? Did you check the bodywork when wet?, Check the Tyres, look at the walls / Centre of the Tyres, are they Ok? what is the Clutch Travel? how far does the Clutch Pedal rise before the car starts to Bite?, check all the carpets also the Boot, take out the spare & check the well for corrosion, there are many things that a good eye is needed regards 2nd hand cars, you have done the First By asking advice, do not be pushed into buying, do NOT TAKE OUT the SO CALLED Extra Warrantee ( Rubbish), when in the car, get it up to max temp, this should sit Half way, let the engine run with the heater on, does it give continues heat? If not, air Lock in the System, check ALL THE ELECTRICS, do they all work? has it 2 sets of keys? does it have the Radio Code, don't forget Flob, it's the buyer market out there, Barter Barter for everything, if you do not like the price, way away there are plenty out there.