Q: My air is blowing cold-hot-cold-hot-cold-hot...

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My air was not blowing as cold as it used to, so we put some coolant in. After that, it blew colder for about 2 hours and then it started blowing hot. Then it blew cool again, and then hot. It mostly blows warm air now, as if it does not work, but once in a while, it will blow cold air for about 5 seconds.

My car has 68000 miles.
My car has an automatic transmission.

It is possible that you have a leak in the AC system. There are pressure switches that will turn off the compressor if the pressure is too high or too low. The low refrigerant level could cause the AC compressor to cycle on and off. If you would like to have this done, a certified technician from YourMechanic can come to your car’s location to diagnose the AC system and make the correct repair.

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Do not have the car in gear when letting off the clutch and putting on the parking brake. It is normal for the fan to continue to run after it is shut off for a few minutes to completely cool...

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You would need to have the cooling system pressure tested to verify the leak but I would have to say it is most likely the heater core leaking.

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