Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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If it has been replaced and plugged up again over time this can be due to debris in the cooling system passing into the heater core and plugging it up over time.I would have the complete coolant system flushed out including the drain plugs removed from the engine block to drain out any lower settling debris.If this has been done already and a new heater core installed this can be an issue with low coolant flow into the heater core.This will cause debris to settle in the core and cause this and is usually caused by low flow from the water pump circulating coolant in the engine to the heater core.
If the heater core was not replaced but was flushed once or more times and continues to plug up this can be an issue with the core not open enough to allow proper flow through it and will plug up again and does need replaced.I hope this makes sense here.If all of these have already been checked or performed let me know.
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