Re: two questions. wait...three. wait...four... - Saab 900 Bulletin Board - Saabnet.com
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Re: two questions. wait...three. wait...four...
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Posted by Jeff Cullen (more from Jeff Cullen) on Sun, 18 Sep 2011 10:55:39 Share Post by Email
In Reply to: two questions. wait...three. wait...four..., darcey, Sun, 18 Sep 2011 10:26:00
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1) you have a vacuum leak under your dash. unlikely to be a component itself, more likely a split hose. There is a vacuum hose that goes from the intake manifold into the cabin on the driver's side and then splits to the boost gauge, APC pressure transducer, and if you have a LH2.2 car (I think yours is '87 so you do) the overboost switch. Check out the hoses between these components and the tees that do the splitting. Easiest to pull the knee bolster to work in here... does your climate control act up under boost? try setting the hvac direction control to each setting and do a boost run -- see if you can hear any of the vacuum canisters actuating when you hit boost. If so, you need to check out another vacuum hose that goes from the intake manifold across the windshield and then into the vacuum canister in the passenger fender well. this should have a functional one-way valve on it at the input, then the output goes into the cabin and eventually to what I like to call the octopus, which attaches to the back of the directional control and has tentacles going to each of the vacuum canisters that control the vent flappers.

2) I think by '87 they were using gray for constant 12v and red for switched 12v.

3) you probably knocked off the left connector to the instrument cluster. Reach around in there for a white plug that goes into the driver's side of the cluster and try to re-seat it

4) interior lighting relay under back seat?

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