1987 GMC R3500 w/o AC;. 1988 GMC R3500 w/o AC;. 1989 GMC R3500 w/o AC;. 1990 GMC R3500 w/o AC;. 1991 GMC R3500 w/o AC;. Part Type: HVAC Heater Core. Aluminum Heater Core. Heater Core.
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