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Below is a modest collection of Volvo vacuum connection diagrams I have located or created from Volvo service manuals and other sources. 
I'm always looking for more diagrams to help our fellow Volvo owners who are having a tough time locating these. 
 
Please don't write me to ask if I have more diagrams. Sorry -  I DON'T.
 
If you can help find more, please write me.
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Click to enlarge images
       
240 B21E 1981-                   240 B21E/F 1975-77                 240 B21E/F 1976-78


       
         240 B21E/F 1978-            240 B21 E/F 1978-79        240 B21E/F 1980-84


          
    240 B21E 1979, B21F 1979-81           240 B21ET 1984-85            240 B21F 1976-77 Ver.1                            
 (Idle Compensation)                                                                                                                           


       
                         240 B21F 1976-77 Ver. 2             240 B21F 1981                260 B28F 1981                           


             
       240 B21FT control pressure regulator         240 B21FT manifold              240/740 B23/230 throttle body &
                                                                                                       charcoal cannister


        
   S70/V70 (850) T5 1998        240 vent control diagram


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