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I have a 2000 wrangler and there is water coming out of the drain tube with the heater on. Do you think that the heater core is going bad.
 

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That's the condensation drain tube that will drip whenever the a/c compressor is running. And the heater turns on the a/c compressor whenever it's in one of its two Defrost settings. The a/c compressor is turned on then because it helps to defog the windows much faster.
 
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