To reinstall the heater core reverse the removal steps.
2007 pontiac grand prix heater core removal.
Lift the core from the case.
Pay close attention while removing parts so they can be reinstalled correctly.
Take care not to damage the fins of the heater core when removing.
Do not use force.
There will be coolant leaking from the heater core use an old towel to help control spillage.
Remove the air cleaner and duct assembly if the grand prix has a 3 1l engine.
Remove the heater core securing brackets and or clamps.
Remove the old core.
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Remove the cable and or vacuum control lines if equipped.
Remove the access panels s or the split heater air conditioning case to gain acess to the heater core.
Drain the coolant from the cooling system make sure you use a clean container for it if the coolant can be reused.
Unplug the cable from the negative battery terminal.
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Remove the heater coolant hoses.
Step 15 once removed pull back gently on the plenum assembly while keeping an eye out for anything that was missed such as ductwork once its released remove it from the vehicle.