How to change the heater core 2004 impala - 2004 Chevrolet Impala

SOURCE: CHANGING THE HEATER CORE OF AN 04 IMPALA

Drain the coolant. Remove the dashboard first, then a bunch of air ducts, then the heater core cover. Remove the heater hoses in the rear of the motor, and finally the heater core.

SOURCE: Heater core instructions for 04 Chevy Impala SS

Before you go thru that expense. If it is water leaking,check the evaporator. Sometimes it gets plugged with debris. So first, decide if it is water or anti-freeze. Also, I have taken the heater hoses off of the inside of the motor area and flushed the core out. It works on some.

SOURCE: 2004 Chevy Impala no heat from defrost or heater

No heat is often a symptom of low coolant, usually followed by overheat. There are other controls that regulate heater, but right now, re-fill the cooling system with engine running and heater on high, then check for leaks (coolant you lost went somewhere...you need to determine where) Low coolant will damage your engine. Take care of that first, then if heater still does not work, then do diagnosis on that. (if you loose the engine heat won't matter, will it!)

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SOURCE: 2004 Chevy Impala no heat. Fan OK. Engine warms

Your heater core is clogged. You can fix it. Disconnect the two heater hoses and put one into a bucket. Use an air compressor to blow into the other - it'll flush the contents into the bucket. Then reverse it - put the hose you blew into, in the bucket, and blow into the one that was in the bucket. This way, whichever side of the core had the clog, you can blow it out. Reconnect the heater hoses, and then burp the system or you can end up with air bubbles in the cooling system that can cause you to overheat. Click my screenname, go to Tips and Tricks, and follow the procedure there - it'll walk you through the whole procedure step by step.