Volvo Coupes/Sedans/Wagons 1970-1989 Repair Guide

VACUUM DIAGRAMS

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See Figures 1 through 13

Because Volvo was one of the first manufacturers to introduce reliable fuel injection on all their U.S. cars, the underhood area is mercifully free of complicated vacuum hose routing. 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.



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Fig. Fig. 1: Always differ to the vacuum routing diagram located under the hood



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Fig. Fig. 2: Crankcase hose routing-B20B engine



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Fig. Fig. 3: Crankcase valve and hose routing-dual PCV valve B27F engine shown, B28F engine similar



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Fig. Fig. 4: Diesel crankcase hose routing-upper: D24 engine; lower: D24T engine



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Fig. Fig. 5: Crankcase ventilation system and hose routing-B27F, B28F and B280F engines



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Fig. Fig. 6: Crankcase ventilation hose routing-B230F turbo engine



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Fig. Fig. 7: Crankcase ventilation system and hose routing-B21, B23 and B230 engines



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Fig. Fig. 8: Vacuum hose routing-B28F and B280F engines



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Fig. Fig. 9: Hose routing for evaporative emissions control system-B28 and B280 engines



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Fig. Fig. 10: EGR hose routing-B280F engines



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Fig. Fig. 11: Crankcase ventilation system-B28F and 280F engines



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Fig. Fig. 12: Schematic of evaporative emissions control system-DL and GL shown; other models use a similar system design



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Fig. Fig. 13: Schematic of evaporative emissions control system-760 shown; other 700 series models are similar

 
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