1987 740 GLE -- Vacuum Canister Shot -- can I improvise?

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Jamie - 08 Jun 2006 23:43 GMT

Symptom:
Air coming out of A/C vents very weak.

Diagnosis:
I traced the vacuum line through the firewall and to the T fitting
where it splits through the vacuum check valve and to the intake, and
the other direction goes to the vacuum canister.

>From the T-fitting to the intake I removed the vacuum check valve,

tested it, then cut the ends and reassembled everything on the hoses.
This is OK.

I removed the vacuum hose from the T-fitting to the vacuum canister,
checked to see no-body was watching and attached my "pulmonary pump" to
the vacuum hose. (I blew into the hose).

The air flowed freely -- something was shot. I looked and looked and
could not locate the canister. Correction - I could not ACCESS the
canister. So, at the T-fitting I sealed off the opening with electrical
tape and tested the vents. Great air flow - it worked.

So, now what can I do about the canister? Can I buy another one, mount
it somewhere else and run a new line?

Thanks!

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Jamie - 09 Jun 2006 03:04 GMT

I had to unseal the end of the T-fitting that goes to the vacuum
canister. It seemed to be choking the motor. When I unsealed the
T-fitting, the motor aspirated better, but I lost my ventilation
pressure for the A/C. I am guessing maybe a canister from AutoZone?

> Symptom:
> Air coming out of A/C vents very weak.
[quoted text clipped - 21 lines]
>
> Thanks!

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Jamie - 09 Jun 2006 14:52 GMT

Regarding the above, I have no idea how to access that bugger. I got
under the car and it looked like I needed to remove the bumper on my
740 to get to the canister.

> I had to unseal the end of the T-fitting that goes to the vacuum
> canister. It seemed to be choking the motor. When I unsealed the
[quoted text clipped - 26 lines]
> >
> > Thanks!

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