i got a mustang repair manual off advance auto parts online for 79-93 mustangs, has an ok diagram. book costs $27.99
To the Haynes manual!
Mustang Electrical and Vacuum Diagrams Try the links listed below.
http://www.mustangbarn.com/73vacuum.html
The vacuum system diagram for the '93 Mustang 2.3 Liter engine may be found at the following link: http://www.autozone.com/autozone/repairguides/Ford-Mustang-1989-1993-Repair-Guide/VACUUM-DIAGRAMS/VACUUM-DIAGRAMS/_/P-0900c15
Google search - 351M vacuum diagram
vacuum line diagram
Which vacuum diagram The Underhood for the engine or the vacuum for the interior /AC system?
try M-VACUUM DIAGRAMS search at yahoo.com under Toyota tercel vacuum. 91 to 94 are same
vacuum diagram "R" us !
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