Cruise Control Problems

Ed Kellock ekellock at
Tue May 16 11:36:29 EDT 2006

I probably have the weak pump issue as well on my 230k Avant.

I also have an issue with the climate control, another CC... sometimes it
will not blow A/C from the center vents.  It will switch to those when I go
to Econ, but even BI-LEV won't switch to the center vents completely.  I
wonder if this could also be related to the weak vacuum pump situation.


On 5/15/06, TooManyAudis at <TooManyAudis at> wrote:
> Wondering if anyone has BTDT w/ cruise control problems on a '91  Avant.
> I've checked fuses, tested the throttle servo w/ vacuum, tested  the
> brake and clutch switches to ensure they hold vacuum and dump  vacuum
> when depressed.  I teed the line from the pump and it makes  slight
> vacuum when setting cruise or hitting resume, but not much.   I'd go
> through the test procedure in the Bentley book, but I can't even  find
> the damn cruise ECU control unit, and the manual (section 97) is  not
> much help other than it's looks like it's somewhere under the dash  on
> the passenger side..  It has to be the worst over-$100 manual  ever
> published.
> My wife has a bad knee and needs the cruise.   She's gonna give me one if
> I don't get this fixed?  Any  suggestions?
> Joe Mott
> '91 200TQ Avant
> I've had to replace the pump in my 200q.  Are you getting any  indication
> that the pump is coming on at all?  Mine would hold on a flat,  barely,
> but could
> not keep up when hitting the accel mode, or on hills.  A  replacement pump
> cure it.
> I happen to have one that was sent to me to fix the cruise on my 88 80q
> and
> would be happy to sell it for what I paid.  Turned out to be the
> brake  cruise
> switch / valve thingy had worked its way loose, so it wasn't making  good
> contact when the brake was in the upright position.  If I push up on  the
> brake
> pedal, the valve closes completely and I have cruise.  That may  be
> something
> to check as well.
> -- Tom
> 91 200q -- for sale.  check market for latest info.
> 88 80q - still running after all these years...
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