I'm look for help on my overheating issue with my Focus. I bought it just over a month ago from a used dealer, cheaply as it has a few little faults (loose drivers electric window button, heater resistor broken, boot lining missing etc), all in all I'm very pleased, it's a '99 1.6LX Hatch with Air Con and being 19 finding insurance for £400 less than I could for any other car was just icing on the cake and it's unbelievably quicker than my Fiesta 1.8D '92 which was stolen hence the new car requirement
After a week or two the temperature gauge would rise when at speed or up hills, for example going from 60-70mph on a motorway would be fine but decelerating from 70-60 it would rise unless I accelerated again (would make a great excuse when being pulled over ), or going up a steep hill on a dual carriage way, it slowly got worse where it'd be fine up until a motorway or a-road stretch when it would start increasing even on minor 30mph roads afterwards. Eventually it did get too high one time and flicked the fail safe cooling system. At this point I took it back to the dealer who diagnosed the problem as the thermostat and replaced it the next day for me.
Worked for a couple of days before it overheated again but this time it would not do so on a motorway run or a hill on a dual carriageway, instead it overheated on small gradients on roads of 30-40mph. I then remembered that when I collected the car from the dealer and run it home the heater was on it's hottest setting, and that since the overheating started again it was set to cold. For the last week I've had the heater on it's hottest setting and it hasn't budged from the center of the gauge since.
I love the car, if someone gave me £20,000 to buy a car I know exactly what I'd buy, it puts a huge smile on my face every time I get in it. But I can't sort out the small issues until I know what the cause of the overheating is. I fixed the heater resistor today thanks to some advice on here and saved myself some money there. Hopefully someone can enlighten me