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Cruise control does not work

Tiny
ELITEFIT1
  • MEMBER
  • 1997 AUDI A4
  • 4 CYL
  • 2WD
  • MANUAL
  • 160,000 MILES
I love my car listed above with a 1.8 turbo. Except for the electrical gremlins. My problem is that my speed control only works when it is really hot outside, and the car has been sitting in the sun for a while. I do not know how to even access it. I think it's on the right-side passenger underneath the glovebox? But who knows!
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Thursday, October 7th, 2010 AT 8:43 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
More than likely this is an issue with the cruise control vacuum pump. Within this system this is the only component that would be affected by heat. So, I suspect you have a leak in the line going from the pump to the servo.

So, we should connect the pump to a gauge and then drive the vehicle to find out if the pump is working.

Here is a guide that talks a little bit about this:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

The other likely cause is the servo itself.

I am attaching the info on how to replace this below so let me know what questions you have.

Thanks
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Monday, January 31st, 2022 AT 11:22 AM

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