1988-1991 GMC K3500 5.7L V8. 1992-1995 GMC K3500 5.7L V8. Position: Inlet. Notes: HVAC Heater Hose Assembly. Notes:Without RPO Code C36 (Auxiliary Heater). Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.