Q: Overheating for no apparent reason suddenly and after a longer drive
My car that has around 150,000 miles on it keeps overheating for no apparent reason. It suddenly starts showing that it reached the hot zone when I just start driving. When it happened a couple of times, my AC used to blow hot air instead of cold. Now it blows cold when it is overheated.
I've had all kinds of testing, from coolant checking to bleeding the coolant system, replacing the radiator cap, changing the thermostat. Also, the water pump was replaced. After that, while driving around town, it ran great so I decided to go to a longer trip. Then it started overheating again. It happened after about 25 miles of driving to the point that it couldn't be driven anymore. Please give me some advice on what to check next.
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