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It could be a blocked heater core if your fan works... Or it could be your thermostat... I have an 03 that is doing the same thing. I just replaced the thermostat and it is still doing it. There is a site called BlazerForum.com you may get some better answers there

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14y ago
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Q: Why has the heater in my 1996 Chevy blazer stop working?
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