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You can but you still won't be able to get it out.

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Q: Can you cut through the firewall to replace the heater core in a 2000 Chevy blazer?
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Replace heater core in 1997 Chevy blazer?

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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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