cruise control does not work

1997 AUDI A4
160,000 MILES • 4 CYL • 2WD • MANUAL
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ELITEFIT1
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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!
Oct 7, 2010 at 8:43 PM
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KASEKENNY
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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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Jan 31, 2022 at 11:22 AM