no to hard if your a 10 year old boy... you need to fit under the passenger dash and some of the bolts are realy hard to get at... i would say you will need either a flex extention or a U-join socket... other then that if you replace the whole assembly its taking it out and putting it back in! that's all!
how do you change a heater core on a 2003 ss Monte Carlo
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Under the dash
heater core
This is sort of a difficult job. The black housing under the hood (on the passanger side) has to be removed. The heater core is mounted inside that housing.
On the passenger side on the firewall.
One reason a 2004 Monte Carlo heater motor blower may not work is low coolant. You can check the coolant level after the car has been turned off.
Your heater core is likely bad