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01 silverado heater core flush.
Take the lines off the heater core and flush with a pressure washer.
Is your coolant level correct.
Be sure the container can hold at least the capacity of your vehicle s coolant system.
Pull the hoses off and use a garden hose to flush the core.
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Place a container beneath the vehicle to catch drained fluids.
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Push into the cold line first.
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You will need to flush all of the coolant and grime out of the heater core and a portion of the coolant system into a container on the ground.