Well this could be connected to water ingress. Often water collects in the boot where there are several fuse boxes so you need to empty the boot and dry everything, a hair dryer is useful. Warm all of the fuses and apply WD40 or similar when you replace them. Ensure that the drain holes are all clean. Let us know how you get on. Simon
Car Won't Lock/Unlock, hot air doesn't blow, 2009 A5
Hello, I've been having a few problems with my 09 lately and I can't seem to figure out what the cause is. A while back my parking brake stopped releasing automatically (which made it useless for hill starts), though it still worked fine for parking. At some point, I found a water bottle stuck under the passenger seat and when I pulled it out that essentially cured the problem. That problem hasn't returned for a couple of months now, but I'm wondering if it's related to the following two issues:
About 2 months ago the passenger door lock stopped working. It wasn't seized, but wouldn't open without pulling the handle, and once opened from the inside it would no longer unlock (including using the interior buttons). I just lived with this problem hoping to fix it later.
At around the same time, a problem showed up where air won't blow out of the vents. The heater core still seems to heat up just fine as the vents are noticeably warm (and eventually warm the car) but no air blows out. This includes the windshield defroster.
All three of these problems have been on and off to varying degrees, but now that I'm on break I'd like to get them fixed (permanently I hope).
After looking through the fuse locations I found that the passenger door control module, parking brake, and several heater components are in the same fuse box (in the trunk). I found no blown fuses but after clicking everything back into place the door locks seemed to function perfectly. The vents still weren't blowing air so I went inside to look for a few more fuses and when I came back out the doors wouldn't unlock.
That's basically where I'm at right now. I'm out of clues as to whether these issues are electrical or mechanical and what I can do to fix them. I've seen a bunch of posts on here about similar problems with the door locks but I don't know why it would be temporarily fixed by fumbling with the fuses if it's a mechanical issue.
Any help would be greatly appreciated, thanks!
About 2 months ago the passenger door lock stopped working. It wasn't seized, but wouldn't open without pulling the handle, and once opened from the inside it would no longer unlock (including using the interior buttons). I just lived with this problem hoping to fix it later.
At around the same time, a problem showed up where air won't blow out of the vents. The heater core still seems to heat up just fine as the vents are noticeably warm (and eventually warm the car) but no air blows out. This includes the windshield defroster.
All three of these problems have been on and off to varying degrees, but now that I'm on break I'd like to get them fixed (permanently I hope).
After looking through the fuse locations I found that the passenger door control module, parking brake, and several heater components are in the same fuse box (in the trunk). I found no blown fuses but after clicking everything back into place the door locks seemed to function perfectly. The vents still weren't blowing air so I went inside to look for a few more fuses and when I came back out the doors wouldn't unlock.
That's basically where I'm at right now. I'm out of clues as to whether these issues are electrical or mechanical and what I can do to fix them. I've seen a bunch of posts on here about similar problems with the door locks but I don't know why it would be temporarily fixed by fumbling with the fuses if it's a mechanical issue.
Any help would be greatly appreciated, thanks!
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I took everything out down to the battery and didn't see any indication of water damage. Everything seemed to be completely dry and not corroded. I spent some time with the hairdryer on everything (including the fusebox) just in case, but it didn't seem to have any effect. I'm not sure where the drain holes are, but I assume since everything's dry they are working just fine. I'm also not quite sure what you mean by apply WD-40 (to the fuse contacts?).Well this could be connected to water ingress. Often water collects in the boot where there are several fuse boxes so you need to empty the boot and dry everything, a hair dryer is useful. Warm all of the fuses and apply WD40 or similar when you replace them. Ensure that the drain holes are all clean. Let us know how you get on. Simon
Let me know what you think, thanks for the advice.
Speak of the devil. I just took the car for a ride and on the way back the air blower started working and when I parked it the passenger door would lock/unlock normally but not the driverside door. It is a particularly warm day, so maybe that has something to do with it. This is a mess.
1 - 4 of 4 Posts
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