Having problems with your 1999 Chevrolet Blazer ?
Where is the heater core located - 1999 Chevrolet Blazer
The heater core is usually located against the fire wall behind the dash on the passenger side of the vehicle follow your heater hoses to where they go into the wall this will give you a pretty good idea as to where the core is.
Repair Help & Product Troubleshooting for 1999 Chevrolet Blazer
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