Q: Heat isn't working.

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My a/c went out summer 15. I never was able to get it fixed due to income and just being a single mom . It's. Now Jan 17 my heat stop working yesterday 1/24/17 . I noticed a few weeks ago at a red light the heat was cold on a freezing day I thought the car hadn't had enough time to warm up so , I then turned the tempature knob completely off and then turned back on to heat side and heat began working normally. I assumed it's related to the knob being that the issue i had a week ago. I checked my coolant level it was low so I added more coolant (the proper amount max.) I thought the heat would then work and it hasn't. I don't know what else to do. I have to take my kid to and from school daily and I'm hoping it will be working by tomorrow morning so he's not freezing again. Please let me know of anything I can do myself that can help.

My car has 216889 miles.
My car has an automatic transmission.

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