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If it is anything like my 93, your heater hoses run from the heatercore through your firewall. Mine is located in the center most are located on the passenger side. Pop your hood look at your firewall you should see two hoses relatively close together coming out of it, those should be your heater hoses, and they are a pain. I'm trying to get them on the new heater core now...

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Q: Where are the heater hoses located on 1990 Pontiac Grand Am?
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