Cruise control does not work

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!

Thursday, October 7th, 2010 AT 8:43 PM

1 Reply

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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