Phaeton :: Low Volume Buzz Whenever HVAC Blower Running
Jan 26, 2014
A few days ago I noticed that the front tweeters were producing a low volume buzz whenever the HVAC blower is running.
Let me explain it: The HVAC system is in auto, I am listening to a CD track and the track finishes. At the very short period that it takes for the new track to play I can hear that distinctive buzz coming from the front tweeters. If I now turn off the blower and repeat the same sequence I cannot hear the buzz.
I would say that the buzz frequency is not correlated to the blower speed, but it is difficult to assess because of the increased volume of the blower at high speed.
I have checked the pins and the wiring at the amplifier connectors and they are all sound, so I am wondering if the smoothing capacitor that sits at the plenum chamber fuse box might be the culprit.
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Today something strange happened to HVAC. The air blower is always set at full speed regardless of the HVAC setting, mode, etc. The fan speed control does nothing now, even turning the HVAC off is not working.
The only way is to shut the ignition, even when the ignition is off, the solar ventilation function works even when it is set to off!
I believe that a relay or a contractor from the solar ventilation is jammed but not sure because I've re coded the roof electronics to "no sunroof" at all but still didn't work.
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I have a problem that's sprung up all of a sudden and I wanted to run it by you before taking it in to VW. For the past three days or so the blower on my Phaeton's HVAC has been unresponsive to my control, staying on its highest setting permanently, even when I turn off the car.
This of course means that overnight power management takes over and when I get to the car in the morning I have to unlock it with the physical key, the clock has to be reset and I get all kinds of warnings about level fault and system fault. These warnings go away immediately as the car powers up, and everything is back to normal except for the fan.
I've tried resetting all settings on the control unit, but since the fan stays on even when the car is off, I feel like it's not software? The rest of the HVAC settings seem to work fine- I can toggle the vents and change the temperature, just not the blower speed.
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2005Accent. First question: Just replaced blower assembly last week and worked normally. Now the blower operates even with the car off and the no keys in the ignition. The fan speed selector still switches between all speeds whether it's running or not, so it doesn't seem to be the resistor.
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I'm new and have recently bought my first X. its a 2001 XLT with the 5.4. I really couldn't pass it up with the guy asking under 7K with 104,000 miles and not a rust bucket.
I discovered last night that my blower (at least front) continues to blow when key is out and off. I have played with the key to think its a switch but am not sure. Here's the other part, If I turn the selector to off before shutting the truck off it stays off BUT if i turn it on it will not go back off and stays on....
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My 1995 Ford motorhome blower does not work. The motor works fine. All threads say to follow the circuits to troubleshoot. That is nearly impossible with wiring harnesses. I need a Ford F- Series HVAC wiring schematic to find ALL of the electrical components, in order to test.
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I am struggling with it, and need to get it done - by myself, as I can't afford a service job. I am handy, and comfortable doing it, But I am confused about how to get into the blower housing.
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So I just picked up a 08 STL. I noticed that it doesn't get a lot of airflow out of the vents or floor. I initially thought that it was door actuators. I checked the vacuum at all of them and they all cycled as required.
I also checked the blend door, and the fresh air doors as well. They all cycled as desired. When I was checking my fresh air door with the borescope, I noticed a layer of... insulation maybe? on top of the inlet for the blower. So I removed the blower, and the picture below is looking up into the housing. Is that supposed to be there? It appears extremely dense, so I am led to believe that's what is causing my flow issues.
If it does not belong, how to remove it? Where is the fresh air inlet on this thing?
Full size : [URL] .....
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Just got back from a 1200 mile camp trip pulling an 18K toy hauler. 500 miles into the trip the HVAC blower stopped working. Right after the torrential downpours we had last week. Did some limited checking and found the relay under the hood real hot. Swapped it out with the DEF relay and no luck. All the fuses were good.
This was in the Littleton, MA area. Dragged the truck and camper to a Ford dealer who had no interest - "make an appointment for sometime next week". Dragged the trailer to another Ford dealer who was equally not interested. From here we towed the 130 miles to our next stop.
You really miss your HVAC when you have to drive with all the windows open and two fur dropping Golden Retrievers in the back seat. The fur just circles around and ends up either in your eyes, nose or mouth.
Next day I was off in search of a repair. 20 or so miles north I find the next Ford dealer not intrested. Now I'm pissed and rant a little bit at the dealer.
I did almost 20 years in new car service, all highway dealers. Not once did we turn down a vacationing family on the road with vehicle troubles. We have even done engines and transmissions for travelers broken down.
60 miles to the next dealer in Laconia, NH, Irwin Motors, Ford, Lincoln and Toyota.
Same initial story “we are really busy and backed up”.
But, if I was willing to wait a little bit they would see what they could do.
45 minutes later I get the news that I need a blower motor and it is ordered.
No problem. I show up at 2, park the 5<sup>th</sup> wheel in the lot and at 3:30 we have a free wash coupon and we are on our way. And the service people couldn’t have been more pleasant to deal with. Even the techs came out to visit the dogs as we were walking around. 5 stars for Irwin Motors.
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I bought my youngest daughter a used 2009 Ford Escape (out of warranty) a week ago. Manual HVAC controls, 3.0 V6, AWD, 73K miles. The HVAC blower motor do not seem to move any air on speed 1 and 2. However speeds 3 and 4 appear to operate normally. Speed 4 noticeably puts out more volume of air then 3. Each 3 and 4 operator what seems to be normal speeds for their setting.
I would normally suspect resistor but my experience is usually that you have all or nothing not it's partially working like this is. I don't mind throwing a new resistor in there and trying it but I rather come up with a better way of troubleshooting it then throw parts at it.
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Was 7 degrees F out this morning. Went to turn on the defrost and heard this: (may need to turn up audio a bit)
2013 F150 HVAC blower noise in cold temps - YouTube
There was some snow/ice buildup under the "grate" that sits above that I imagine is the air intake for the blower. Hoping that it was just Ice buildup that will thaw out.
I ended up having to turn it on because the condensation on the windshield was becoming a safety issue when I drove into work. Motor made quite a high pitched wine. Better that than slid into a car.
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My HVAC blower switch only works when I put it on 5 (the highest setting). What needs to be replaced (besides the whole truck)?
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Blower motor only seems to be working on the 3 & 4 position? Resistor bad? What is the location?
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I have a 06 Mercury Mariner and this past week fuse #26 keeps blowing turning the HVAC blower motor off. I replaced the blower motor since i had one already in the garage and same thing is happening. The AC will run for awhile and in about 10/15 mins the fuse will blow. Fuse #26 is the Climate control system mode switch, are these known to go bad? Is this the part I should replace or look for other problems IE compressor?
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We have a problem with my daughter's 2000 Ford Escort air conditioner. It has cold air but the blower doesn't put out any volume. We had a 1998 and it had the same problem but not this bad. Is this a problem for this car and worse for this year? How to increase the air flow?
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My HVAC blower motor stopped today while the wife was driving the F250. I thought I should swap relays (with the heated mirror relay - same Ford Part Number) to rule it out or identify it as the culprit. However, since these are close to the firewall, I have a hard time getting the grip and leverage to pull the relay out of the Battery Junction Box (BJB). How to make this a bit easier?
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My Elantra's HVAC fan has always been a quiet thing, even on 3.....we won't mention level 4 and the fact it sounds like a 747 at takeoff.
I kid you not, the very evening I hit 60,000 miles and the general warranty expired, the blower motor started making noise like it was throwing a bearing and definitely sounded like some light metal-on-metal rubbing. After I became irritated at this, the noise went away and didn't come back until just a few weeks ago. I could make it stop by smacking on the bottom of the fan assembly a few times but I want a more permanent solution.
Tonight I dropped the blower out which was stupid easy except for the fact you're upside down in the dark with your head in a hole. But three screws and an electrical connector later, I dropped the assembly to find no serviceable components. I mentioned this to friend of mine who's into Volvos suggested spraying some lithium grease on the hub of the blower and letting it run long enough to quiet it down. I'll do this over the next few days and report back but part of me thinks a new blower may be in my future.
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Over the past year we have been noticing that the HVAC blower doesn't turn on from time to time. All settings in the control panel seem normal and the fan speed is turned on. Most of the time everything is working normally, sometimes when the car starts the blower isn't working and then starts after a minute of driving. Sometimes I notice the blower isn't working and I turn up the fan speed and after a few clicks it starts working normally for the remainder of the drive. And then sometimes the blower doesn't ever start and I need to turn off and restart the car a few times. When the blower hasn't been working the a/c compressor has been turning on, something in the blower circuit is failing.
There are five possibilities:
The HVAC controller isn't telling the blower to turn on
The power relay isn't always working
There is a wiring or connection problem
The blower motor itself isn't working
The power mosfet is failing.
What needed to be replaced?
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I have a 2004 Phaeton that the main volume knob has broken on. The dealer tells me that the only way that they can provide a replacement is with the whole unit (nav screen and all) at a cost of over $2000. It seems to me that this part MUST be available somewhere for $20 or so.
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Noticed that sometimes the audio volume is zero when I turn on the ignition even though when the key was taken off after the previous drive, the volume was on.... Is there a "solution"....
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Our Phaeton sound system, and the OnStar, seeming to work but with no audible volume and no response to volume control changes. I fiddled with the AM, FM, CD, OnStar and it all seemed to be working OK (it was possible to change CDs, change CD tracks, change radio stations, etc), except there was no volume from the system at all, and no response to volume increase attempts.
I tried shutting down and restarting the car - and then shutting down followed by the two key twists to the left, and then a restart - all to no effect. I later turned off the car for about ten minutes and when the car restarted, the sound system was back to normal again.
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