you do it from the inside of the car, behind the dashboard
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.
remove the entire dashboard.
With a sledge hammer and a bottle of febreeze
Remove the dash. This job is NOT easy.
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.
you usually have to take apart the entire dash to get to it
First remove the right front speaker and cover then remove the top bolts in the heater box and the remove the heater hoses out front in the spare tire compartment. Then remove the two straps holding the heater core in place. Reverse order for installation.
At least 20"x30" or large enough to remove water heater.
underneath the dashboard on the passenger side.
The heater core is located in the middle of the dash behind the center console. You have to take the console out to see the heater core.
You can replace the sheer core, on your 2004 Pontiac Grand Prix, by removing the water lines. Remove the four bolts that hold the heater core in place. Reverse the process to install the new heater core.
This is an extremely big job to remove the Heater A/C case on Chevrolet Equinox and Pontiac Torrent when there is a problem with no heat or can/t adjust temperature. ----------