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I am having the same problem.. I have already had to replace the intake manifold gasket cause it was leaking, still no heat. We will be flushing out the heater core to see if that's the problem. I may have to replace the heater core, we will see.

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2006-11-19 18:14:00
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Q: Your 2000 blazer started blowing out air that was not warm when the heater was on. It started working after about 15 minutes.?
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