1975 GMC K25 Suburban w/ A/C;. 1976 GMC K25 Suburban w/ A/C;. 1977 GMC K25 Suburban w/ A/C;. 1978 GMC K25 Suburban w/ 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.
