Awhile ago I started not to have heat in my car. I had the heat on but it's not nearly as hot as other cars. I've noticed when I'm just sitting in a parking lot when the cars running in park. That's when it really blows cold air, but when I drive it gets a little hotter. Its really frustrating because I'm not having any signs of the heating core going out or is already out and I just payed a mechanic 75 dollars to flush just the heater core a month ago and now it's starting to do the same thing as before. Also the temperature gauge is always fluctuating between the middle and cold. What can be wrong?
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