If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
The heater housing is disassembled to get to the heater core.
Heater Core
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
SOURCE: changing serpentine belt 3.8 2007 pontiac grand
SOURCE: How do you remove the
Please click on this link:
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c15280090f6d
good luck....
SOURCE: 1999 grand prix, heater core went out. Need help
you are going to need a manual with a diagram.because you going have to remove parts under the hood.you going have to remove floor console.and lower instrument panel insulator. on both sides.
SOURCE: i have a 2000 grand prix 3.8 with heater problems.
The blend door may not be working properly. It is actuated by a vacuum motor.
or the following part may be bad:
Blower Motor Control Module
Removal & Installation
To Remove:
To Install:
Install the blower motor resistor assembly. Install the rear screw and tighten the forward screws. Connect the electrical connectors to the blower motor and resistor assembly. Install the insulator under the right side of the instrument panel.
SOURCE: how to remove heater core 2004 grand prix
The entire dash does not need to be removed.
Disconnect the heater inlet and outlet hoses which enter the firewall directly under the 'hard lines' for the AC'. near the center/driver side of the fire wall. Note: A cable operated clamp removal tool helps access. They sell them at Autozone in the 'OEM' tool section)
Remove the lower kick panels on both sides.
Remove the seats and console and carpet (to access and remove the duct which goes from the bottom of the heater core outlet cover to the back seat area)
Remove the outer heater core cover.
(Note: First time through the outer heater core cover is held on only by heat stakes, no screws. You need to break the head of each of these heat stakes (look like donuts) to remove the case.
Remove the inner heater core cover (also heat stakes).
Remove the heater core.
Installation is reverse of removal.
You'll need to drill the marked dimples next to each of the now broken heat stakes. Drill 5.5mm holes in cover in these areas and replace cover with screws which should be available from GM dealer.
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