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Old 11-10-2019, 12:11 PM
Yukoner Yukoner is offline
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HVAC squeal ?

So on one of my E90s (the 335i) and on my E84, I've noticed an intermittent squeal-like sound from the HVAC system. I can 100% confirm it's the HVAC system, as on both vehicles, if I turn HVAC completely off, the sound immediately goes away and never comes back. When I turn it back on, there it is.

It happens more in colder weather than warmer, which is why I could finally reproduce it to the point of taking a decent video. Here's the link:




Video starts with the HVAC running, then at 0:05 I turn the HVAC system completely off, then at 0:08 I turn it back on. I'm assuming this is a squeal from a bearing in the blower motor ? Or something to that effect ? As I mentioned, the EXACT same noise happens on both vehicles, intermittently. Also very strangely (albeit likely coincidental), it seems to more likely to squeal while driving if I'm turning the wheel..... .....

Thoughts ?
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Old 11-10-2019, 11:19 PM
SchmidieTX SchmidieTX is offline
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Blower motor is dry...meaning over time the dynamo(motor) is taking corrosion. Cant lubricate it because it's going to stink. I would just change it.
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Old 11-11-2019, 08:05 AM
dharmabmw dharmabmw is offline
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Had this problem a few years ago. The noise would go away while turning left. The blower motor died last December so I went through the excerise of replacing the motor. It's quite an undertaking so be prepared for a large bill if you have it done.
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Old 11-11-2019, 08:27 AM
relative4 relative4 is offline
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Quote:
Originally Posted by dharmabmw View Post
Had this problem a few years ago. The noise would go away while turning left. The blower motor died last December so I went through the excerise of replacing the motor. It's quite an undertaking so be prepared for a large bill if you have it done.
Did you just say replacing the blower motor is "quite an undertaking"?

If you've never done anything mechanical before, it'll take you like 20 minutes.
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Old 11-11-2019, 08:46 AM
SchmidieTX SchmidieTX is offline
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Yeah blower Is not that hard to take out. YouTube is your friend. Literally right next to your junction box. There is a screw that holds the blower. Once you take it out the screw, turn the blower counterclockwise. Might take a little force to turn it.
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Old 11-11-2019, 12:04 PM
Yukoner Yukoner is offline
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Thanks folks. I assumed it was the blower motor. I'll order a replacement to have on-hand. Hopefully this one doesn't die out on me over the next few months - not really that interested in trying to swap it out at -20 degrees
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Old 11-11-2019, 12:15 PM
SchmidieTX SchmidieTX is offline
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Good luck man. There are plenty of how-to videos regarding blower motor removal/installations on YouTube. Vehicular DIY channel has great video contents pertaining BMW E series.
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Old 11-11-2019, 01:23 PM
dharmabmw dharmabmw is offline
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I should have mentioned the blower motor was on my E61. Extensive dismantling of the dashboard was required, hence my comment that it's a huge job. If the E91 is easier, then that's awesome.
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Old 11-11-2019, 01:24 PM
Yukoner Yukoner is offline
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Quote:
Originally Posted by SchmidieTX View Post
Good luck man. There are plenty of how-to videos regarding blower motor removal/installations on YouTube. Vehicular DIY channel has great video contents pertaining BMW E series.
Already checked a few out - nothing special as I've done blower motor replacements in many cars before (the last one was in a Smart Fortwo). More so that it's decently cold outside right now and I don't really want to do it until spring time
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