I have a 2003 Ford Focus that I purchased in 2012. It has continually been having overheating issues, and I have replaced the radiator, thermostat, water pump, timing belt and hoses. It was fine until last week when I drove it for about 45 minutes on a hot day and the yellow light went on and the needle moved to the right past the half way point. I waited for it to cool off and drove it home, also 45 minutes and everything was fine. It has not overheated since then. I took it to two mechanics and no one could find anything wrong with the cooling system. Any idea what this could be?
I can think of few reasons why your car is overheating.
- Fan not working
- Your car is actually fine just the sensor is messed up (if I'm wrong and you do nothing you will damage the engine).
- Hot days and low speed (stuck in traffic) might cause your car to overheat if your fan isn't working properly or cooling system isn't in proper condition
- Blown head gasket(air gets inside the cooling system)
- Air in the cooling system
I had a 2002 Focus Wagon for 5 years. The last two, I had overheating issues anytime I get stopped in traffic in 80+ degree weather. It was the fan relay-fan never kicked on. Local shop "fixed" it for me by wiring the fan to run continuously. This worked ok in summer, but in winter I got horrible fuel mileage and my heater did not work well at all-with fan running continuously in cool or cold weather, the engine never reached optimum operating temperature. Finally I put in a toggle switch so I could control the fan. Sorta "Fred Flintstone", but it worked. I hope Ford has figured this out since then!