by 
towjoe
ANSWERS: 2
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Are you asking where it is? I have changed the one in our old 88 Suburban - took about 90 minutes and it's on the inside behind the glovebox in the ductwork there if memory serves. Wasn't that hard, just took a little time. It is also bolted from the outside on the firewall inward as a hint to get it out. Hope that helps.
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If you are not a mechanic, you don't want to tackle this one. Chevy heater cores are notorious. You pretty much have to take the whole dash out. For further info. consult a Chilton guide; Your local library may have this available for check out (I get them at mine.) Best of luck!
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