GM Cadillac 1967-1989 Repair Guide

VACUUM DIAGRAMS

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Following is a listing of vacuum diagrams for most of the engine and emissions package combinations covered by this guide. 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 car's original equipment, refer to the diagrams below for the same or similar configuration.

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

See Figures 1 through 59



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Fig. Fig. 1: Vacuum circuits - 1976 models



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Fig. Fig. 2: Vacuum circuits - 1979 Fleetwood with 7.0L engine Fed. (Carb.)



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Fig. Fig. 3: Vacuum circuits - 1979 Fleetwood with 7.0L engine Alt. (Carb.)



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Fig. Fig. 4: Vacuum circuits - 1979 Fleetwood with 7.0L engine Calif. (Carb.)



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Fig. Fig. 5: Vacuum circuits - 1979 DeVille with 7.0L engine (Carb.)



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Fig. Fig. 6: Vacuum circuits - 1979 Fleetwood with 7.0L engine (EFI)



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Fig. Fig. 7: Vacuum circuits - 1979 Seville with 5.7L engine Fed. (EFI)



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Fig. Fig. 8: Vacuum circuits - 1979 Seville with 5.7L engine Calif. (EFI)



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Fig. Fig. 9: Vacuum circuits - 1979 Eldorado with 5.7L engine Fed.



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Fig. Fig. 10: Vacuum circuits - 1979 Eldorado with 5.7L engine Calif.



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Fig. Fig. 11: Vacuum circuits - 1980 Fleetwood and DeVille, Calif.



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Fig. Fig. 12: Vacuum circuits - 1980 Fleetwood and DeVille, except Calif.



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Fig. Fig. 13: Vacuum circuits - 1980 Fleetwood and DeVille, Calif.



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Fig. Fig. 14: Vacuum circuits - 1980 Fleetwood and DeVille, except Calif.



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Fig. Fig. 15: Vacuum circuits - 1980 Eldorado and Seville (DEFI)



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Fig. Fig. 16: Vacuum circuits - 1980 Eldorado and Seville (DEFI)



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Fig. Fig. 17: Vacuum circuits - 1980 Eldorado and Seville (EFI)



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Fig. Fig. 18: Vacuum circuits - 1980 Eldorado and Seville (EFI)



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Fig. Fig. 19: Vacuum circuits - 1981-82 Fleetwood and DeVille, diesel except Calif.



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Fig. Fig. 20: Vacuum circuits - 1981-82 Eldorado and Seville, diesel except Calif.



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Fig. Fig. 21: Vacuum circuits - 1981-82 Fleetwood and DeVille, V6 engine except Calif.



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Fig. Fig. 22: Vacuum circuits - 1981-82 Fleetwood and DeVille, V6 engine Calif.



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Fig. Fig. 23: Vacuum circuits - 1981-82 Fleetwood and DeVille, 6.0L engine except Calif.



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Fig. Fig. 24: Vacuum circuits - 1981-82 Fleetwood and DeVille, V6 engine except Calif.



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Fig. Fig. 25: Vacuum circuits - 1981-82 Eldorado and Seville, V6 engine Calif.



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Fig. Fig. 26: Vacuum circuits - 1981-82 Fleetwood and DeVille, 6.0L engine Calif.



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Fig. Fig. 27: Vacuum circuits - 1981-82 Eldorado and Seville, 6.0L engine except Calif.



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Fig. Fig. 28: Vacuum circuits - 1981-82 Eldorado and Seville, 6.0L engine Calif.



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Fig. Fig. 29: Vacuum circuits - 1983, V6 4.1L engine auto. trans. Calif.



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Fig. Fig. 30: Vacuum circuits - 1983 DeVille, 6.0L engine Fed. (DFI)



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Fig. Fig. 31: Vacuum circuits - 1984 V8 4.1L engine Fed. and High Alt. (DFI)



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Fig. Fig. 32: Vacuum circuits - 1983 DeVille, 6.0L engine Fed. (Carb.)



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Fig. Fig. 33: Vacuum circuits - 1984 V8 4.1L engine Calif. (DFI)



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Fig. Fig. 34: Vacuum circuits - 1984 V8 4.1L engine Export (DFI)



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Fig. Fig. 35: Vacuum circuits - 1984 Limo., V8 6.0L engine Export (DFI)



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Fig. Fig. 36: Vacuum circuits - 1984 Limo., V8 6.0L engine Fed. (DFI)



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Fig. Fig. 37: Vacuum circuits - 1985 V8 4.1L engine Calif. (DFI)



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Fig. Fig. 38: Vacuum circuits - 1984 Limo., V8 6.0L engine Calif. (DFI)



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Fig. Fig. 39: Vacuum circuits - 1984 Commercial Chassis, V8 6.0L engine Fed. (DFI)



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Fig. Fig. 40: Vacuum circuits - 1985 V8 4.1L engine Export (DFI)



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Fig. Fig. 41: Vacuum circuits - 1985 V8 4.1L engine Calif. (DFI)



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Fig. Fig. 42: Vacuum circuits - 1985 V8 4.1L engine Export (DFI)



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Fig. Fig. 43: Vacuum circuits - 1985 V8 4.1L engine High Alt. (DFI)



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Fig. Fig. 44: Vacuum circuits - 1985 V8 4.1L engine Fed. (DFI)



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Fig. Fig. 45: Vacuum circuits - 1985 V8 4.1L engine Calif. (DFI)



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Fig. Fig. 46: Vacuum circuits - 1985 V8 4.1L engine Fed. (DFI)



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Fig. Fig. 47: Vacuum circuits - 1985 V8 4.1L engine Fed. (DFI)



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Fig. Fig. 48: Vacuum circuits - 1985 V8 4.1L engine Fed. (DFI)



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Fig. Fig. 49: Vacuum circuits - 1985 V8 4.1L engine Calif. (DFI)



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Fig. Fig. 50: Vacuum circuits - 1986 DeVille, Limo. V8 4.1L engine Fed. (DFI)



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Fig. Fig. 51: Vacuum circuits - 1986 DeVille, V8 4.1L engine Fed. (DFI)



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Fig. Fig. 52: Vacuum circuits - 1986 DeVille, V8 4.1L engine Calif. (DFI)



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Fig. Fig. 53: Vacuum circuits - 1986 Limo, V8 4.1L engine Fed. (DFI)



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Fig. Fig. 54: Vacuum circuits - 1986 Commercial Chassis, V8 4.1L engine Fed. (DFI)



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Fig. Fig. 55: Vacuum circuits - 1986 DeVille Limo., V8 4.1L engine Export (DFI)



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Fig. Fig. 56: Vacuum circuits - 1986 Eldorado, Seville V8 4.1L engine Calif. (DFI)



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Fig. Fig. 57: Vacuum circuits - 1986 Eldorado, Seville V8 4.1L engine Fed. (DFI)



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Fig. Fig. 58: Vacuum circuits - 1986 Eldorado, Seville V8 4.1L engine Fed. (DFI)



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Fig. Fig. 59: For 1987-89 models, refer to the Vehicle Emission Control Information Label located under your hood

 
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