Part Type: A/C Accumulator. 1990 GMC Safari Submodel: Base; Engine: 4.3L V6; EngineCode: LB4; EngineVIN: Z; with Rear A/C; Without Service Port;. 1990 GMC Safari Submodel: Base; Engine: 4.3L V6; EngineCode: LU2; EngineVIN: B; with Rear A/C; Without Service Port;.