1967 GMC K15/K1500 Suburban Engine: 5L V6 GAS; W/O A.C.; Position: Fan and Air Pump;. 1969 GMC K15/K1500 Suburban Engine: 5L V6 GAS; W/O A.C.; Position: Fan and Air Pump;. 1968 GMC K15/K1500 Suburban Engine: 5L V6 GAS; W/O A.C.; Position: Fan and Air Pump;.