Volvo Maintenance Hints for 7xx/9xx - Bill Garland's Nuclear ...

5. Remove knee bolster at driver’s side (2 screws , 2 nuts)
6. Remove knee bolster bracket (2 bolts)
7. Remove ashtray -Slide parking brake cover back 4-5" (6 screws)
8. Remove "switch cover" right of steering wheel (disconnect switches and light)
9. -Remove radio, compartment under radio and the whole radio compartment ( 4
screws, wires for cig lighter + 2 panel lights )
10. Lift relay assembly to right side (plastic inhex screw)
11. Remove the ECC control console (4 screws)
12. Remove driver’s side “side feeding” duct (round 90 degree behind radio
compartment driver’s side)
13. Slide off duct feeding passenger side ("carefully with force")
14. Remove duct coming from “air distribution housing” to “upper face and side
vents”.
15. Remove air grilles (both sides) from floor distribution box (2 #2PH screws per
grille).
16. Disconnect temp sensor at driver side heater housing, disconnect one
connector passenger side and check for others obstructing floor distribution
box.
17. Remove fixing screw for floor distribution box
18. Driver side floor duct was soft and tin plastic and could be "bent" enough (again
"carefully with force") to get it off the floor dist. box.
19. Once driver side of floor dist. box is loose it can be pulled back and slightly
right.
20. Now the double acting "motor" can be accessed through a down facing
opening.
21. Pry washer off lever (washer will brake) unscrew the two nuts and vacuum
motor comes out.
22. Mount new motor and test them all with pump and meter.
23. Reassemble in reverse order.
Well I'm not sure which one is faster , easier or better but I had hard time getting the
motor out and back in again even if I had an opening about 4*5" to work through. It
took me 4 hours work to get it done. Care should be taken not to break many of the
numerous plastic clips and tabs that keep everything fixed. Most time went to find
replacement lock washer and to puzzle the ducts back together (a lot harder then to
get them out). The procedure is not to recommend for people with bad backs, short
nerves, or large hands. Noticed also that this one was the easiest to change , the
other two ( single action ) would require the complete air distribution box to be taken
out.
Volvo Maintenance FAQ for 7xx/9xx/90