GM Full-Size Trucks 1988-1998 Repair Information

VACUUM DIAGRAMS

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Following are vacuum diagrams for most of the engine and emissions package combinations covered here. Because vacuum circuits will vary based on various engine and vehicle options, always refer first to the vehicle emission control information label, if present. Should the label be missing, or should vehicle be equipped with a different engine from the vehicle's original equipment, refer to the diagrams below for the same or similar configuration.

If you wish to obtain a replacement emissions label, most manufacturers make the labels available for purchase. The labels can usually be ordered from a local dealer.

See Figures 1 through 64





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Fig. Fig. 1: 1988-89 (VIN Z) C/K series with 4.3L

 


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Fig. Fig. 2: 1988-89 (VIN Z) C/K series with 4.3L, export

 


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Fig. Fig. 3: 1988-89 (VIN H) C/K series with 5.0L, AT

 


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Fig. Fig. 4: 1988-89 (VIN K) C/K series with 5.7L, Calif.

 


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Fig. Fig. 5: 1988-89 (VIN K) C/K series with 5.7L, AT

 


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Fig. Fig. 6: 1988-89 (VIN K) R/V series with 5.7L, AT, Calif.

 


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Fig. Fig. 7: 1988-89 (VIN H) C/K series with 5.0L, MT

 


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Fig. Fig. 8: 1988-89 (VIN K) C/K series with 5.0L, Calif.

 


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Fig. Fig. 9: 1988-89 (VIN K) R/V series with 5.7L, AT, High Altitude

 


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Fig. Fig. 10: 1988-89 (VIN K) R/V series with 5.7L, Calif.

 


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Fig. Fig. 11: 1988-89 (VIN K) V-series with 5.7L, MT

 


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Fig. Fig. 12: 1988-89 (VIN K) R/V series, GVW rating greater than 14,000 lbs., Federal and California

 


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Fig. Fig. 13: 1988-89 (VIN K) R/V series with 5.7L, MT, Altitude

 


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Fig. Fig. 14: 1988-89 (VIN N/W) CK series with 7.4L, Federal/Altitude

 


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Fig. Fig. 15: 1988-89 (VIN N/W) C series with 7.4L, California

 


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Fig. Fig. 16: 1988-89 (VIN N/W) R/V series with 7.4L, California

 


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Fig. Fig. 17: 1988-89 (VIN C/J) CK, RV series with 6.2L, Export

 


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Fig. Fig. 18: 1988-89 (VIN C/J) R/V series with 6.2L, Federal

 


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Fig. Fig. 19: 1990 (VIN H) 5.0L; without AIR

 


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Fig. Fig. 20: 1990 (VIN H) 5.0L; with AIR

 


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Fig. Fig. 21: 1990 (VIN K) 5.7L; without AIR

 


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Fig. Fig. 22: 1990 (VIN K) 5.7L; with AIR

 


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Fig. Fig. 23: 1990 (VIN N) 7.4L

 


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Fig. Fig. 24: 1991 (VIN Z) 4.3L; without AIR

 


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Fig. Fig. 25: 1991 (VIN Z) 4.3L; with AIR

 


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Fig. Fig. 26: 1991 (VIN H) 5.0L

 


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Fig. Fig. 27: 1991 (VIN K) 5.7L; with AIR

 


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Fig. Fig. 28: 1991 (VIN K) 5.7L; without AIR

 


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Fig. Fig. 29: 1992 (VIN Z) 4.3L; without AIR

 


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Fig. Fig. 30: 1992 (VIN Z) 4.3L; with AIR

 


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Fig. Fig. 31: 1992 (VIN H) 5.0L

 


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Fig. Fig. 32: 1992 (VIN K) 5.7L; with AIR

 


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Fig. Fig. 33: 1992 (VIN K) 5.7L; without AIR

 


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Fig. Fig. 34: 1992 (VIN N) 7.4L; without AIR

 


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Fig. Fig. 35: 1992 (VIN N) 7.4L; with AIR

 


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Fig. Fig. 36: 1993 (VIN Z) 4.3L; without AIR

 


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Fig. Fig. 37: 1993 (VIN Z) 4.3L; with AIR

 


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Fig. Fig. 38: 1993 (VIN Z) 4.3L; with canister purge solenoid

 


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Fig. Fig. 39: 1993 (VIN H) 5.0L

 


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Fig. Fig. 40: 1993 (VIN K) 5.7L; without AIR

 


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Fig. Fig. 41: 1993 (VIN K) 5.7L; with AIR

 


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Fig. Fig. 42: 1993 (VIN J) 6.2L

 


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Fig. Fig. 43: 1993 (VIN N) 7.4L; with AIR

 


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Fig. Fig. 44: 1993 (VIN N) 7.4L; without AIR

 


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Fig. Fig. 45: 1994 (VIN Z) 4.3L; with canister purge valve

 


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Fig. Fig. 46: 1994 (VIN Z) 4.3L; without canister purge valve

 


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Fig. Fig. 47: 1994 (VIN H) 5.0L

 


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Fig. Fig. 48: 1994 (VIN K) 5.7L; with AIR

 


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Fig. Fig. 49: 1994 (VIN K) 5.7L; without AIR

 


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Fig. Fig. 50: 1994 (VIN N) 7.4L

 


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Fig. Fig. 51: 1994 (VIN S/F) 6.5L

 


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Fig. Fig. 52: 1995 (VIN Z) 4.3L

 


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Fig. Fig. 53: 1995 (VIN H) 5.0L

 


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Fig. Fig. 54: 1995 (VIN K) 5.7L

 


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Fig. Fig. 55: 1995 (VIN S/F) 6.5L

 


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Fig. Fig. 56: 1995 (VIN N) 7.4L

 


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Fig. Fig. 57: 1996-98 (VIN W) 4.3L

 


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Fig. Fig. 58: 1996-98 (VIN M) 5.0L

 


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Fig. Fig. 59: 1996-98 (VIN R) 5.7L; US and Canada

 


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Fig. Fig. 60: 1996-98 (VIN R) 5.7L; Export

 


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Fig. Fig. 61: 1996-98 (VIN F/S) 6.5L; with EGR

 


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Fig. Fig. 62: 1996-98 (VIN F/S) 6.5L; without EGR

 


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Fig. Fig. 63: 1996-98 (VIN J) 7.4L; A/T

 


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Fig. Fig. 64: 1996-98 (VIN J) 7.4L; M/T

 

 
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