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Hello everyone, I have a 2001 Civic EX coupe and I am noticing when I stop my car at a stoplight the heat will blow cold, however when I continue after the stop, the air will gradually warm up again. I have checked all fluid levels and that all seems to be in order. Any idea what may be going on?

 
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The engine must be up to operating temerature for the heater to consistantly blow out hot air.

 
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I am having the same problem with my 01 Civic. The engine heats up fine and never fluctuates. I am assuming this means that the head is okay and the thermostat is okay...right? From reading the other threads, it sounds like it might be a heater core issue. Any other thoughts?

 
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I'm not sure how easy it is to get to the thermostat, but that's the first thing I would replace. It's cheap.... Then go on to more expensive stuff. Does the temp of your engine remain constant, or does that fluctuate when this happens? For some reason I seem to remember someone else had this problem, can't place it though. Good luck.

 
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If the thermostat is bad, the engine temp would be affected I think...right? I will probably do this to be safe, but I don't think this is ultimately the problem.