Question about 1999 Pontiac Grand Am GT
The heater core is located forward of the glove box to the left of the fan. the process for changing it is not complex, but if you have A/C, you will have to use caution not to disturb the system unless you can reservice it yourself. Once the the heater core cover is removed, you should see both that and the evaporator coil (towards the front). Just pop the clip and remove the core.
I would recommend getting the Haynes manual for your vehicle.
Hope this helps.
Posted on Aug 31, 2008
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Posted on Jan 02, 2017
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