Your vents work off vacuum from the engine. The system relys on the check valve (#1) to prevent loss of system vacujm back into engine under heavy acceleration. If you loose air out of the dash vents and suddnly feel air at your feet this is the first thing to check, check it by pulling it off and blowing through the black side you should be able to suck but not blow, if you can blow through it the valve is bad. The little hose also tends to get old and split at the connection to the check valve assembly (#2) I ended up replacing the hoses on all 3 of my 240s, the one on my turbo split at the firewall where I couldn't see it and caused all kinds of diagnostic fun. To change hose (7/64") pop it off the metal "L" and pull the grommet out of the firewall (#3) then move to the inside to remove hose from vacuum canister. |
Loosen the 1/4 turn fasteners that hold the pad over passengers feet (#1) and the fasteners that hold the side panel on the center console. (#2) & (#3) #2 is your standard screw and #3 is a 1/4 turn fastener. Once the side panel is off pull down the pad. |
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Pull the hose off the metal 90 degree fitting, if you have a vacuum source you can apply some vacuum and see if it holds. I put 10" on the system in the turbo and let it sit for 5 munutes, there was no change indicating no leaks. |
Stick the new hose through the grommet and route it up to the intake and back onto the check valve assembly, shove it through the hole and put the grommet back into the hole. |
Slip the new hose onto the vaccum canister and put everything back together. Your vents should be working as good as new. |
