How to Remove the Heater Core in a 1999 Chevy Blazer

The heater core regulates the coolant and airflow in your 1999 Chevrolet Blazer’s heating system. If the heater core develops a leak, one of the first common symptoms is a haze or condensation inside the windshield. Buy a replacement heater core from an auto parts retailer and change it at home in minutes.

Things You'll Need

• Phillips screwdriver

Instructions

1. Raise the hood of your Blazer. Locate the heater box on the firewall. It will be a black box with two hoses running into it.

2. Remove the two screws on either end of the heater box with a Phillips screwdriver. Lift the cover off the box. Lift the heater core out of the box. Insert the replacement heater core in the same alignment as the one you removed.

3. Replace the cover of the heater box. Insert the screws and tighten them with a Phillips screwdriver. Close the hood of your Blazer.

References

• “1999 Chevrolet Blazer Factory Service Manual”; General Motors Corporation; 1998