Remove the heater hoses (after draining some antifreeze) and take the cover off that whole plastic assembly under the hood. It's a large cover that comes right up to the cowl and close to the wipers. You have to remove the long hood seal that stretches across the firewall left to right.
Now, there are many small screws (8mm head I believe and probably more than one size, 1/4" too I think) around the hood hinge and I believe one screw underneath the blower motor, so that has to be removed as well. Make sure you get all the screws and don't try to pry harshly. The plastic will break easily.
The unit is sealed and you must carefully break the seal all the way around the cover. After you have that removed you have to take another screw out on top of the heater core- it's a bracket that hold it down and pull the heater core carefully straight up- it will be a bit difficult but you must pull it out of the clip at the bottom. Wiggling back and forth may help a bit.
Now, install the new heater core by reversing the procedure, being careful not to break the plastic cover. Re-seal the cover with black silicone and use enough to be sure it will seal well. Re-attatch the heater hoses, install the blower motor, reconnect any wiring, fill the radiator with coolant and there you go!
How to change a heater core on a 1997 Pontiac grand am
Where is the heater core for a 2002 pontiac montana
To change the heater core on a Pontiac Aztek, locate the heater core on the firewall, passenger side of the vehicle. Remove bolts on the firewall and the clamps on the hoses. Take out the old heater core and replace with new. Tighten bolts and hose clamps. Then check to make sure the radiator is full of antifreeze.
Remove the water supply lines to your 1985 Pontiac Trans Am heater core. Remove the heater core retaining bolts. The heater core will come out. Reverse the process to install your new heater core.
where is the heater core at
where is the heater core for a 1992 bonniville
heater core has a leak replace heater core
Begin by training the water from your 1997 Pontiac Bonneville cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
It is cheaper to replace the heater core than it is repair it
change out the heater core
how to change heater core in 98 suburban
its located on the heater core