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Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19450
Experience:  ASE Master Certification. GM World Class Certification
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1999 chevy blazer: /c works but heater doesnt work.

Customer Question

troubleshooting heater failure, 1999 chevy blazer. a/c works but heater doesnt work.
Submitted: 8 years ago.
Category: Chevy
Expert:  Dave Nova replied 8 years ago.

The heater core is likely clogged with sediment from the dex cool antifreeze. Disconnect the heater hoses, run water through the heater core with a garden hose in both directions. You will see the brown sediment flush out of the heater core. Flush the heater core until the water runs clear. It would be a good idea to flush the cooling system as well then refill the system with a 50/50 mix of water and new antifreeze.