I have done that with classic Mustang heater cores. Those cars with plain heaters were a sinch to remove though and I did the job with the heater core on the ground.
The sludge that settles to the bottom of the heater cores can be a chore to flush out that way.
I have never done this with the core still in a car.
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The sludge that settles to the bottom of the heater cores can be a chore to flush out that way.
I have never done this with the core still in a car.