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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.
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Replace heater core in 1997 Chevy blazer?
how to replace a heater core in a 1997 Chevy blazer
How do you replace a heater core in a 2001 Chevrolet Blazer?
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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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