How do you replace a heater core on a 1992 Honda Accord?
Pretty much the exact same way you do it on every car, totally
remove the entire dash and everything you need to take out to do
that, then just replace it like a little radiator like it is. It is
usually about a 12~14hr job depending on how many of these you have
done, and it costs about $1400.00 plus part price which for that
car is $450.00 to have it done by a mechanic. My advice is, wait
till summer and sell the car because without the heater turned on,
it wouldn't leak because the valve to the core is shut off
disallowing the coolant to flow into it.