trouble with the "REST" feature
Thread Starter
AudiWorld Senior Member
Joined: Jul 2001
Posts: 1,940
Likes: 42
From: Kansas City
trouble with the "REST" feature
My heater will run on the rest feature only two or three minutes if left to run its course. Sometimes if I set it , the system turns off when I open the drivers door. It then refuses to reset and makes noises like some thing is going on in the dash. Anyone else have this happen to them?
AudiWorld Super User
Joined: Apr 2003
Posts: 2,300
Likes: 0
90% of all A8s lose the Rest feature. The Pump always runs, and it's LOUD and obnoxious.
The power plug for the pump is right next to the brake fluid reservoir.
If you disconnect it, the pump will never run again, and the noise will go away.
It has a purple color code piece.
If you disconnect it, the pump will never run again, and the noise will go away.
It has a purple color code piece.
Banned
Joined: Oct 2000
Posts: 950
Likes: 1
It has a low voltage shutoff, so battery charge? Connections? Post-shutoff noises aren't the pump
but probably the flaps moving to their parking position.
I'm pretty sure it has a low voltage shutoff because pulling up on the switch for an already-closed window will sometimes shut mine off.
If that's why yours is shutting off early, it could be because of low battery charge, a tired battery, or a less than perfect power or ground connection on the way to the HVAC controller.
Tom
I'm pretty sure it has a low voltage shutoff because pulling up on the switch for an already-closed window will sometimes shut mine off.
If that's why yours is shutting off early, it could be because of low battery charge, a tired battery, or a less than perfect power or ground connection on the way to the HVAC controller.
Tom
Banned
Joined: Oct 2000
Posts: 950
Likes: 1
100% of them eventually lose it. Dust to dust etc. But 90% already?
I just don't hear independent Audi mechanics talking about that pump failing so often. What seems to be a good mileage for preemptively changing it?
Tom
Tom
AudiWorld Super User
Joined: Apr 2003
Posts: 2,300
Likes: 0
Re: 100% of them eventually lose it. Dust to dust etc. But 90% already?
The pump doesn't fail; it's control mechanism does.
The pump runs when the car is running, and it makes a very annoying gear-motor whine/grindy sound.
Once again, the pump runs when it's not supposed to, it does not fail.
The pump runs when the car is running, and it makes a very annoying gear-motor whine/grindy sound.
Once again, the pump runs when it's not supposed to, it does not fail.
Trending Topics
Banned
Joined: Oct 2000
Posts: 950
Likes: 1
The pump is meant to run with the car on if there's any heating demand
So says a footnote in the service manual. I'd have thought it would shut down at higher revs or during low demand for heating when it seems to be superfluous, but no...
Tom
Tom
AudiWorld Stories
Bringing Audi to Life for Audi Fans
10 Strangest Audi Designs That Actually Made Production
Joe Kucinski
2027 Audi Q7 and SQ7: Audi Upgraded EVERYTHING!
Michael S. Palmer
Audi Unveils Absurdly Cool New Supercar: 10 Things You Need to Know!
Verdad Gallardo
The Highs & Lows of Every Audi C-Class Generation
Joe Kucinski
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer
Brett Foote
10 Audi Features & Options We Miss the Most!
Joe Kucinski
Audi Recreates Crazy-Looking Speed Record Breaker From 1935
Verdad Gallardo
Coachbuilder Recreates the 1995 Audi TTS Concept
Verdad Gallardo
Every Audi V10 Car Ranked!
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
Skydive69
TT (Mk1) Discussion
4
Apr 21, 2001 07:15 PM