not that bad! about 3hr to do. all under the center dash!
Heater Core Replacement
Removal Procedure
Remove the HVAC module assembly.
Remove the heater core case cover screws and cover.
Remove the heater core bracket screws and brackets.
Remove the heater core from the HVAC module assembly.
Installation Procedure
Install the heater core to the HVAC module assembly.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the heater core brackets and bracket screws.
Tighten
Tighten the bracket screws to 1 N路m (9 lb in).
Install the heater core case cover.
Install the heater core case cover screws.
Tighten
Tighten the cover screws to 1 N路m (9 lb in).
Install the HVAC module assembly.
Is it hard to change a heater core in a pontiac 2002 sunfire?
In most cars, changing the heater core requires that you empty out all the engine coolant, then get inside your car and take apart your center console until the core is accessible. To find out how involved it is for your Sunfire, check a service manual or go to an auto store and look it up in a chilton's book. In my opinion it's not hard, but it is a pain in the ***. I recommend having a six-pack on standby.
