Q: The heater isn't working right.

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The heater takes to long to START to get warm. Then it will stay warm for a few seconds. Then gets cold again. I'll turn it back off for a few seconds. Then turn it back on and it will be a little warm for a few seconds then gets cold again. This goes back and forth about 30 minutes and if I'm lucking it will finally stay warm. But sometimes it does take a little longer. Up until about 3 months ago it got warm right away and stayed warm. What part might it be and what can I expect it to cost. Thanks, Candy.

My car has 160000 miles.
My car has an automatic transmission.

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