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why does my car heater blows warm and then cold

i have a 2002 honda civic 1.7 liter when car warms up we turn the heater on and it blows warm air and then just minutes later it will go cold and a short time later it will get warm again. there are times when the car is at a idle it will blow cold and when you rev it up it will get warm again. i checked all fluids and they are full and also changed heater contol.the car does not seem to be overheating. any answers

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2 Answers from these members:
Manage My Life
by Manage My Life
November 20th, 2011
Answered in 8 minutes
0 votes
bikerbigpapa bikerbigpapa
by bikerbigpapa bikerbigpapa Earned 7,304 community points in Automotive
November 21st, 2011
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