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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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#1 (permalink) Old 12-07-2004, 09:38 PM
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so i just bought a 93 525i trying to figure out the climate control but i think my problem is that it's not working correctly. one thing that tells me that is because only cold air will come out of the rear vents in the center console.

why does it do that?

someone want to explain the section on the fan dial that is not off or a numbered position?

in between the vents in the center of the dash board is a dial that can either point to a blue dot or a red dot. what does that do?
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#2 (permalink) Old 12-07-2004, 10:07 PM
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Rear vents don't get hot air...only for fresh air from the outside. Check the attached diagram.
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#3 (permalink) Old 12-07-2004, 10:09 PM
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one on the dashboard i never quite understood. i guess it selects where it takes the air in from ?!? engine compartment or the outside. i dont know that one. i have mine on cold when air con is on and on hot during cold months.

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#4 (permalink) Old 12-08-2004, 01:57 PM
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the knob in the middle controls heat. specifically ventalation heat.

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#5 (permalink) Old 12-08-2004, 06:06 PM
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Quote:
Originally posted by liquidtiger720@Dec 8 2004, 08:57 PM
the knob in the middle controls heat. specifically ventalation heat.
[snapback]245907[/snapback]
I am not so sure because it does control the AC as well. Not the Compressor proper but how cold/how hot the air should get. Turn it to the 1st blue dot on 60 degrees, then turn it toward more blues on same degree; it gets colder; same holds true for heat when on 90 while turning red dots!

Who wants to solve the mystery of the middle knob?
I like to think of it as the main console climate control TRIMMER/FINE TUNER if you wish. I noticed more blue= colder AC (independent of main temp setting controls below it) when more red=hotter. While I sound so silly talking reds/blues here; I noticed when turned red while AC is on, cold air becomes less cold and thus a trimmer/mixer/tends to mix hot and cold!! Wow does this make any sense to you guys?

Note: Whether I engage it or not I have AC and/or heat (controlled by the dual main console) but when engaged it tends to fine tune the main climate settings (+ and -) ANYONE? Shed some lights please and correct? What is the internal working mechanism of the knob? Does it act on heater valves/sword and/or AC system? How?
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#6 (permalink) Old 12-09-2004, 12:03 AM
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good point bill. never tried it with the AC on.

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#7 (permalink) Old 12-09-2004, 01:46 AM
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There is a name for that dial, I just can't remember what it's called.

Anyway, that dial controls the temp of the air that blows out of the vent.
The temp settings on the center console however controls the ambient temperature of the interior surrounding.
Which means you can adjust the air to blow out cold or hot from the blower, but whatever temp is set on the climate control, when it reaches that set temp, the AC cuts off or turns on automatically to maintain that set temp.

Makes sense?

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#8 (permalink) Old 12-09-2004, 11:18 AM
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Quote:
Originally posted by CosmosBlack@Dec 9 2004, 08:46 AM
There is a name for that dial, I just can't remember what it's called.

Anyway, that dial controls the temp of the air that blows out of the vent.
The temp settings on the center console however controls the ambient temperature of the interior surrounding.
Which means you can adjust the air to blow out cold or hot from the blower, but whatever temp is set on the climate control, when it reaches that set temp, the AC cuts off or turns on automatically to maintain that set temp.

Makes sense?
[snapback]246335[/snapback]
Cosmos..long time no see!

when you set the temp on the climate control, the vents keep on blowing air (hot or cold) until the TEMP SENSORS (located to the sides of the control and possible on the overhead) read that exact temp and sends a cut off signal.
So to summarize,Three things:
1. The main unit to set temp and get the system going hot or cold.
2. Then sensors (independent components) watching out fo the cabin temp. Think your heater thermostat at home set at 70 shuts down your boiler at 70 once room temp reaches 70. When room temp drops, it kicks in again and hence Auto on console. Example set temp at 70 but don't engage the auto switch, air will keep blowing forever; now kick in auto; at room 70 it will cut off= sensors
3. This is the middle guy puzzle! I say it is a trimmer/fine tuner see above.

But I still don't know the internal mechanism of this thing. Someone will have an answer, I am sure used
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#9 (permalink) Old 12-10-2004, 11:58 AM
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I read what it was in my manual. It's just a control to "temper" the air that typically blows onto your face. I use it a lot. For example, I want the cabin to be warm, so I set the climate control to 68 degrees, but I don't want air that warm blowing right on my face, so I flip the dial toward the blue. That way, I get some semblance of refreshing air on my face while the rest of my body is still nice and warm. I do the reverse in summer with the AC--while I want the cabin cool, if I have the cold air blowing right on my face for an extended period of time my nose starts to get too cold , but I don't want to turn the climate control temp up because then the whole cabin gets too hot. It's a nice feature.

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#10 (permalink) Old 12-11-2004, 03:32 PM
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ok, now does someone want to try to explain the fan control dial?
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#11 (permalink) Old 12-11-2004, 05:09 PM
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Quote:
Originally posted by RIPN RAY@Dec 11 2004, 05:32 PM
ok, now does someone want to try to explain the fan control dial?
[snapback]248104[/snapback]
eh ?

it controls the volume of hot/cold air (depending on what you pick) the fan blows in. it's self-explanatory.

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#12 (permalink) Old 12-11-2004, 07:18 PM
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Quote:
Originally posted by Torque+Dec 12 2004, 12:09 AM--><div class='quotetop'>QUOTE(Torque @ Dec 12 2004, 12:09 AM)</div><div class='quotemain'><!--QuoteBegin-RIPN RAY@Dec 11 2004, 05:32 PM
ok, now does someone want to try to explain the fan control dial?
[snapback]248104[/snapback]
eh ?

it controls the volume of hot/cold air (depending on what you pick) the fan blows in. it's self-explanatory.
[snapback]248146[/snapback]
[/b][/quote]

Guys it all depends on year/model of the car! mine is 97/528i does not have a fan control dial. It has a horizontal switch with a (+,-) symbol plus the AUTO. Other cars have a round dial to control the fan.

I thought we were talking about the THING living between the two outlets high up on the dash. That THING has nothing to do with VOLUME, it is related to the how cold/how hot you want it (think degrees/intensity not volume) as I explained above.

Basic system:
A. fan speed=This is volume; my switch,or dial has min-max range, 3,4 speeds etc (see Torque explanation above)
b. temp. setting= blue-red, degrees from 60-90 single, dual zones
c recirculation button= outside air vs. reserc.
d. Auto: keeps temp constant, after it has been reached, also your AC comp. will kick in here. Just like pressing the blue button with the snow thing on it.
e. The defrost: winshield flow direction with AC comp. kicking in whether you like it or not!!
f. THE THING: I called it a trimmer what ever your temp is set at it will intensify it towards the + or it will make it milder towards the + or - depending on which temp you choose.

I know I made it worse....see my post above....

The million dollar question is : HOW does it work?its internal mechanism. We all have the car manual!!!
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#13 (permalink) Old 12-11-2004, 10:29 PM
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ok so we got the dial in the middle of the vents figured out.

now i want to know about the fan dail. what is the section between the 0 and 1? is that the "auto" which will control the fan speed for you?

for example: what will the fan do in this position

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#14 (permalink) Old 12-11-2004, 11:08 PM
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it will blow very little.

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#15 (permalink) Old 12-12-2004, 01:48 PM
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Don't you have to move one of the 3 levers to the right to get the system going? The temp is 72 degrees!!!
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