Blower starts up automatically or what is it?
#1
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Blower starts up automatically or what is it?
Hi, everyone. I have 1997 A8 3.7 FWD.
I noticed that when I start the car some sound as if a heater sound comes on (like you blow into an empty tank); then I press 'on' button on the dash AC and the sound goes off. After I have to press 'off' button to turn off the AC. I do not have AC charged with gas.
If anyone knows what this is I would appreciate.
I noticed that when I start the car some sound as if a heater sound comes on (like you blow into an empty tank); then I press 'on' button on the dash AC and the sound goes off. After I have to press 'off' button to turn off the AC. I do not have AC charged with gas.
If anyone knows what this is I would appreciate.
#2
On USA cars, (at least facelift cars) the A.I.R. blower runs briefly after startup to inject air into the exhaust and get the cats up to operating temperature. This would not be affected by the AC switch.
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Thanks for explaining. I understand but what I have to do? Keep it running and wait until it goes off? It is little annoy7ing but I can wait if it goes off itself. Will it? However, what worries me is that when I turn the AC on and then off the sound stops and it seems it turns off too. Thanks again.
#4
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Thanks for explaining. I understand but what I have to do? Keep it running and wait until it goes off? It is little annoy7ing but I can wait if it goes off itself. Will it? However, what worries me is that when I turn the AC on and then off the sound stops and it seems it turns off too. Thanks again.
If the noise is really noticeable, the air pump may have a bearing going bad ... common problem. The replacement bearings are exactly the same as those used in skateboards and longboards ... dirt cheap... just rebuilt the pump for my Allroad for about $1.25, with the best bearings I could find.
Last edited by silverd2; 08-24-2017 at 01:01 PM.
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Thanks, so you mean the blower motor bearing? So take out the blower motor and replace the bearing. Is this the procedure audipages Fresh Air Blower Replacement
?
Or there is another motor bearing you are talking about?
?
Or there is another motor bearing you are talking about?
#7
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quattroworld.com Forums: Behind and below the junction of the y-pipe...
In A8's the pump is in the bottom of the air cleaner box.