1987 GMC R2500 w/o A/C;. 1988 GMC R2500 w/o A/C;. 1989 GMC R2500 w/o A/C;. Part Type: HVAC Heater Core. Aluminum Heater Core. Heater Core. Ensure that this part fits your vehicle by entering your vehicle's Year, Make, Model, Trim, and Engine in the Compatibility Table.
