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The heater core on most GM vehicles is located behind the dashboard. You must remove the entire dashboard to gain access to the heater core which is mounted to the backside of the firewall.

try this: http://www.zr2usa.com/mboard/index.php?showtopic=19527&st=0&#entry405342

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โˆ™ 2008-04-18 15:19:37
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Q: How do you replace a heater core on a 2000 blazer?
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