Having problems with your 2004 Chevrolet Impala ?
Chevrolet 2004 heater is blowing cold air - 2004 Chevrolet Impala
I had the same problem. I went to a rad shop and they flushed the system. Works great now. They said I had blockage in the core.
Repair Help & Product Troubleshooting for 2004 Chevrolet Impala
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