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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 07-26-2009, 11:20 PM   #61
lafabritto325ci
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do u happen to have the part no? and where is it located????
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Old 08-08-2009, 01:55 AM   #62
hshirl
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i was away for a while. don't know if you've got the part no. already but here it is: 64118369805
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Old 08-09-2009, 04:26 PM   #63
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thanks... im going to order it and hopefully it fixes the issue... cuz FL summer+black leather+ no AC= FAIL
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Old 08-15-2009, 01:39 PM   #64
lafabritto325ci
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just got done replacing iit and it sure feels alot better!!!! but its hot as hell.... we'll see when i go out with the car later.....
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Old 08-23-2009, 03:14 AM   #65
hshirl
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lafabritto325ci, did the AC problem go away? i'm hoping you have good news for us.
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Old 08-29-2009, 11:06 AM   #66
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, I have this same problem. After reading this and other posts, there are several causes for this issue. The HCV failed, low freon, or issues with stepper motor(s) inside the dash. Seems to me if you get nice cold AC with the engine cool, the freon charge should be fine. Once the engine gets up to temp, hot coolant flows to the HCV, which should be closed with AC on if working properly. If it is failed it sticks open causing the mixed heat/cool air issue. What still confuses me is the folks who replace the HCV and still have the problem. Do the stepper motors send signals to the HCV? If a stepper motor is bad, will it cause the HCV to stick open?
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Old 08-29-2009, 11:33 AM   #67
lafabritto325ci
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hey guys... i replaced my hcv and its still blowing hot air... im taking the car next week to the mechanic so he can look at it and hopefully it needs just a recharge on freon...
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Old 09-12-2009, 02:48 AM   #68
hshirl
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sorry to hear that the problem wasn't solved after replacing the water valve. so did it turn out to be a recharge of your ac system? or is it something else?
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Old 03-03-2010, 12:52 AM   #69
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do u remember how much they charged you to fixed the flap? since they had to took the dash out?


Quote:
Originally Posted by Yellowmann View Post
My AC problem has been fix by Sun BMW dealer locally here. Since I had try to trouble shoot most of what I can on my own, the only thing left was let the pro look at it. They were just that, found the problem to be one of my stepper motor went bad out of the 5 in the dash. They took the dash out and also notice that the center control dial didn't turn the flap correctly to give the right air flow. They made adjustment and its all good now just in time for summer temperature.

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Old 05-29-2010, 06:03 PM   #70
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What if I have warm air coming out of all vents? I cannot find any solutions for that. Andboy got ideas?

Quote:
Originally Posted by EvilGenius View Post
There are two common failure modes of "A/C blowing warm":

If you have warm air blowing on both sides and cold air out of other vents your Heater Control valve needs replaced as it is stuck "open" and making the heater function. This is a common failure in our cars. THE HCV is mounted onto the driver wheel well under the air intake bits.

If you have warm air blowing on the passenger side and cold air on the driver side, you have low refrigerant in your A/C loop. Two steps are required here: 1) find out where the refrigerant went. This usually needs a professionally equipped shop to do, then 2) after the leak is resolved, recharge with proper level of refrigerant.
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Old 06-01-2010, 07:41 PM   #71
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GOod write up need to check all of these. also the hissing noise comes from one i look at? what is this from? the compressor?
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Old 07-13-2010, 06:04 PM   #72
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What if I have warm air coming out of all vents? I cannot find any solutions for that. Andboy got ideas?
Have you found a solution for this yet?
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Old 07-13-2010, 08:23 PM   #73
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I just fixed mine!!!

I replaced the HCV. $87 from BavAuto and I swapped it out in less than 30 minutes. Just in time for the real hot weather.
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Old 05-20-2011, 02:44 PM   #74
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I had similar symptoms before, when i had my temp dial set to the three blue dots and my tempersture set at the at the lowest, my top vents blew out cold air fine. The problem was I kept feeling hot air coming out from gas pedal area. A friend suggested to look over this thread, so I replaced my water valve. Problem solved.

I have not felt as much heat from the foot area for a month or two, but a few days ago, with my climate control set to auto, and my sandals on, I felt warm air coming out from the area that is to the right of the gas pedal. The air coming out was not as hot as before I changed the water valve, but with the temperature and dial set to the coldest, warm air is still coming out from there.

Any thoughts on what the problem is?
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Old 05-20-2011, 05:49 PM   #75
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If you get this figured out, please reply to this thread. I've had that problem for the past 2 or 3 years now. Replaced the water valve - no change. The only way I get cold air is if I don't use the Auto function, but I select the Top and Middle air buttons. The face and top vents will blow cold, but when the car gets hot, the vents by my feet blow hot as hell.

Next step is to remove the dash, however I don't have the time to take the dash out, try and figure out what the broken part is, order the part, wait for it to be delivered, and then put it all back together. I suspect its an actuator motor or a stuck vent... however I can't find individual parts for that on realoem.com. If I even had a guess at the parts it could be, I'd start buying them and replace them when the dash is out. Realoem shows the center vents as one unit. If someone who has done this knows of the individual part numbers that I can order, PLEASE pass that on as I'm so sick of this issue.

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Old 05-20-2011, 06:56 PM   #76
pjo33us
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Check your AC levels first

Guys,

If you have not done so already, have your refrigerant levels checked first. It needs to be EXACTLY to spec (its in the Bentley manual). I had mine charged by a shop and it did not work correctly until I took it back, had them hook up the system and dump some of the refrigerant. It was about 2 pounds heavy.
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Old 05-20-2011, 09:24 PM   #77
rhuie1
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My refrigerant levels checked OK.

I also went back and checked realoem and found some actuators (I forgot I had found them years ago)... unfortunately there is no diagram that shows where these go. They're also not cheap - so I'd rather have a diagram that shows the actuators, or a DIY on how to diagnose and replace these before tearing the dash apart. Already got burned on a water valve I didn't need.
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Old 05-23-2011, 02:07 PM   #78
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Anyone?
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Old 05-26-2011, 01:40 PM   #79
Cobra
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Quote:
Originally Posted by EvilGenius View Post
There are two common failure modes of "A/C blowing warm":

If you have warm air blowing on both sides and cold air out of other vents your Heater Control valve needs replaced as it is stuck "open" and making the heater function. This is a common failure in our cars. THE HCV is mounted onto the driver wheel well under the air intake bits.

If you have warm air blowing on the passenger side and cold air on the driver side, you have low refrigerant in your A/C loop. Two steps are required here: 1) find out where the refrigerant went. This usually needs a professionally equipped shop to do, then 2) after the leak is resolved, recharge with proper level of refrigerant.
would this hold true for hot air coming out with the air system completely off? a ton of hot air comes into the car from the floor panel, only on the driver side, but the air system is off, and the slider in the center is set to 3 blue dots, obviously.
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Old 05-26-2011, 03:02 PM   #80
datssoled
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Quote:
Originally Posted by Cobra View Post
would this hold true for hot air coming out with the air system completely off? a ton of hot air comes into the car from the floor panel, only on the driver side, but the air system is off, and the slider in the center is set to 3 blue dots, obviously.


same here.
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