1987 GMC R3500 with A/C;. 1988 GMC R3500 with A/C;. 1989 GMC R3500 with A/C;. 1990 GMC R3500 with A/C;. 1991 GMC R3500 with A/C;. Part Type: HVAC Heater Core. Compatible Years: 1987 1988 1989 1990 1991.
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