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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 05-16-2008, 09:47 PM   #1
tranceasia8
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A/C blowing @ different temps from vents..

I figured that Id get my car ready for summer today and found that my air condition was blowing at different temperatures. The side vents blow colder than the center vents.
I want to see if it was something that i might have missed before I send it to the dealership. Air is set to recirculate, knob is turned to blue, and the a/c button is on.

Does anyone know if could be a door or valve of some kind? I took the cabin air filter assembly out and the small guard/ wall behind the engine and found the box that controls the vents but I dont know what to look for.

Thanks.

Last edited by tranceasia8; 05-16-2008 at 09:50 PM.
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Old 05-17-2008, 01:59 PM   #2
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I had the same problem, but my passenger vents were blowing hotter than the driver's side. Someone on this forum suggested I get my A/C recharge to fix it, but I haven't had time to take it in.
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Old 05-17-2008, 10:08 PM   #3
tranceasia8
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Quote:
Originally Posted by apollotrance1 View Post
I had the same problem, but my passenger vents were blowing hotter than the driver's side. Someone on this forum suggested I get my A/C recharge to fix it, but I haven't had time to take it in.
ive already had it recharged and still having the same problems.

a buddy of mine said something about a "blender door" ??? dont know wtf he's talking about.
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Old 05-18-2008, 01:52 AM   #4
RB240Z
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Between your center vents there is a turn dial with either red or blue dots. make sure it is on the blue dots. found that out on a cold day wondering why my heat didnt work.
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Old 05-18-2008, 10:54 AM   #5
tranceasia8
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Originally Posted by RB240Z View Post
Between your center vents there is a turn dial with either red or blue dots. make sure it is on the blue dots. found that out on a cold day wondering why my heat didnt work.
that was the first thing i checked.
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Old 05-18-2008, 08:25 PM   #6
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Update**

Ive found that if i either turn on the lower foot vent it makes the air colder from the center dash vents but then then its gets really hot down by my foot.
And if I turn on the upper vent it gets hot by the window.

can anyone help?
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Old 05-18-2008, 08:48 PM   #7
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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 05-18-2008, 10:26 PM   #8
tranceasia8
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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.
thanks, ill look into those.

any idea if the HCV be the cause of the warm air in the cabin?
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Old 05-18-2008, 10:41 PM   #9
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Originally Posted by tranceasia8 View Post
thanks, ill look into those.

any idea if the HCV be the cause of the warm air in the cabin?
No because I'm not there, but HCV's are a common failure mechanism, failing open, so there is always heat going. If you have HOT air coming out, then HCV is probably open. This doesn't eliminate A/C problems that could be happening at the same time.

My A/C went out (evaporator coil got leakes), and after that was fixed, the shop found the HCV was stuck too which just amplified the problem.
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Old 05-18-2008, 10:49 PM   #10
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Your mixing valve is spent...easy fix. Check PN 64118369805 on realoem.com

http://www.realoem.com/bmw/showparts...90&hg=64&fg=18

This is defintely your problem
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Old 05-29-2010, 06:03 PM   #11
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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 07-13-2010, 06:04 PM   #12
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Originally Posted by Adam330i View Post
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   #13
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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 05-26-2011, 01:40 PM   #14
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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   #15
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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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Old 05-26-2011, 08:32 PM   #16
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and is this the heater control valve? part #2:

http://www.realoem.com/bmw/showparts...90&hg=64&fg=18

on autohaus, actual pic:

http://www.autohausaz.com/search/pro...=W0133-1609779,
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Old 05-24-2008, 01:53 PM   #17
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Originally Posted by tranceasia8 View Post
Update**

Ive found that if i either turn on the lower foot vent it makes the air colder from the center dash vents but then then its gets really hot down by my foot.
And if I turn on the upper vent it gets hot by the window.

can anyone help?
what's been happening in my car is ---- if outside temp is lower than my climate control set temp, then footwell blows hot air.
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Old 06-04-2008, 10:33 PM   #18
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Originally Posted by villemus View Post
what's been happening in my car is ---- if outside temp is lower than my climate control set temp, then footwell blows hot air.
I have the same problem. Anyone have a suggestion. I was thinking stepper motor controling the footwell vents, but I don't know. With the AC working OK on the top vents, seems like it would just be a problem with air flow if it was the stepper motor.
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Old 07-24-2008, 11:08 PM   #19
tranceasia8
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Originally Posted by Yellowmann View Post
I have the same problem, I had already changed out my final stage resister and that solved the random blowing problem but still hot air no AC. I had my freon recharged and still didnt fix it. Im going to buy the HVC and DIY on that and see if that fix it.
Quote:
Originally Posted by RN WC View Post
I have the same problem. Anyone have a suggestion. I was thinking stepper motor controling the footwell vents, but I don't know. With the AC working OK on the top vents, seems like it would just be a problem with air flow if it was the stepper motor.
you guys try checking your water valve? ^^
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Old 07-25-2008, 09:41 AM   #20
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Quote:
Originally Posted by tranceasia8 View Post
Update**

Ive found that if i either turn on the lower foot vent it makes the air colder from the center dash vents but then then its gets really hot down by my foot.
And if I turn on the upper vent it gets hot by the window.

can anyone help?
Quote:
Originally Posted by tranceasia8 View Post
you guys try checking your water valve? ^^
Im going to order that from Tisher and replace it. I think it will solve my problem. Do I have to do a coolant flush for this?
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