A Cars forum. AutoBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AutoBanter forum » Auto makers » BMW
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Cooling fan is always running this summer



 
 
Thread Tools Display Modes
  #1  
Old July 23rd 05, 12:43 AM
Trey
external usenet poster
 
Posts: n/a
Default Cooling fan is always running this summer


"gutermuth2000" > wrote in message
news:1_634408_510522338dd205e89750f55f9eb6d7d1@aut oforumz.com...
>I was wondering if my fan clutch was bad in my 2000 323.
> It runs all the time and just seems to be sucking power under hard
> acceleration. Does anyone know at what temp. the clutch starts
> turning the blades? I was hoping that the temp. outside (since its
> been in the 90's) is the cause and when the weather cools down it will
> stop.


the clutch-fan in my truck doesnt kick in until 200 or so.

When the car is OFF (and cold) can you spin the fan by hand?


Ads
  #3  
Old July 24th 05, 12:58 PM
Dean Dark
external usenet poster
 
Posts: n/a
Default

On Sun, 24 Jul 2005 07:16:08 -0400, Shadowdancer >
wrote:

>I wonder if this is related to a problem we've been having with the AC
>on our '98 Z3 convertible, 2.8 litre. We cannot turn it completely off.
>Instead of having 0 1 2 3 4 as controls, it gives us 1 1 2 3 4, so there
>is always cold blowing. Other than that, it works great! Even when the
>outside temp is 90 to 95, the air is chilling in the cockpit.


Most cars' blower motor controls are set to run the fan at low speed
all the time while the AC compressor is engaged. It's done to keep
air flowing through the evaporator matrix to prevent ice from building
up on it. I bet the fan will go off completely if you turn off the AC
button.
--
Dan.
  #5  
Old July 24th 05, 10:44 PM
Dave Plowman (News)
external usenet poster
 
Posts: n/a
Default

In article >,
Dean Dark > wrote:
> Most cars' blower motor controls are set to run the fan at low speed
> all the time while the AC compressor is engaged. It's done to keep
> air flowing through the evaporator matrix to prevent ice from building
> up on it.


Eh? It gets hot, not cold. ;-)

--
*We waste time, so you don't have to *

Dave Plowman London SW
To e-mail, change noise into sound.
  #6  
Old July 25th 05, 03:35 PM
Malt_Hound
external usenet poster
 
Posts: n/a
Default

Dave Plowman (News) wrote:
> In article >,
> Dean Dark > wrote:
>
>>Most cars' blower motor controls are set to run the fan at low speed
>>all the time while the AC compressor is engaged. It's done to keep
>>air flowing through the evaporator matrix to prevent ice from building
>>up on it.

>
>
> Eh? It gets hot, not cold. ;-)
>


Nope. Evaporator gets cold...

<http://home.howstuffworks.com/ac3.htm>

-Fred W
  #7  
Old July 25th 05, 07:42 PM
Dave Plowman (News)
external usenet poster
 
Posts: n/a
Default

In article >,
Malt_Hound > wrote:
> >>Most cars' blower motor controls are set to run the fan at low speed
> >>all the time while the AC compressor is engaged. It's done to keep
> >>air flowing through the evaporator matrix to prevent ice from building
> >>up on it.

> >
> >
> > Eh? It gets hot, not cold. ;-)
> >


> Nope. Evaporator gets cold...


Which heat exchanger are we talking about? The aux fan runs continually to
keep the condenser cool. The interior fan may be switched off, as
there's a probe in that heat exchanger to prevent iceing.

--
*You never really learn to swear until you learn to drive *

Dave Plowman London SW
To e-mail, change noise into sound.
  #8  
Old July 25th 05, 10:58 PM
fbloogyudsr
external usenet poster
 
Posts: n/a
Default

"Dave Plowman (News)" > wrote
> Malt_Hound > wrote:
>> >>Most cars' blower motor controls are set to run the fan at low speed
>> >>all the time while the AC compressor is engaged. It's done to keep
>> >>air flowing through the evaporator matrix to prevent ice from building
>> >>up on it.
>> >
>> >
>> > Eh? It gets hot, not cold. ;-)
>> >

>
>> Nope. Evaporator gets cold...

>
> Which heat exchanger are we talking about? The aux fan runs continually to
> keep the condenser cool. The interior fan may be switched off, as
> there's a probe in that heat exchanger to prevent iceing.


The AIR passing through the evaporator gets cold, the REFRIGERANT (R12 or
R34)
that is going through the liquid-to-gas phase-change inside it is getting
hot.
Opposite in the condenser.

Floyd

  #9  
Old July 25th 05, 11:05 PM
Dean Dark
external usenet poster
 
Posts: n/a
Default

On Mon, 25 Jul 2005 14:58:02 -0700, "fbloogyudsr"
> wrote:

>>> Nope. Evaporator gets cold...

>>
>> Which heat exchanger are we talking about? The aux fan runs continually to
>> keep the condenser cool. The interior fan may be switched off, as
>> there's a probe in that heat exchanger to prevent iceing.

>
>The AIR passing through the evaporator gets cold, the REFRIGERANT (R12 or
>R34)
>that is going through the liquid-to-gas phase-change inside it is getting
>hot.
>Opposite in the condenser.


Yes, in layman's terms a fluid that evaporates sucks in heat; one that
condenses releases heat. It's all made even more efficient and
worthwhile by the latent heat step in the temperature profile of the
transition. But this is getting all too damned scientific.
--
Dan.
  #10  
Old July 26th 05, 01:25 PM
Malt_Hound
external usenet poster
 
Posts: n/a
Default

Dave Plowman (News) wrote:
> In article >,
> Malt_Hound > wrote:
>
>>>>Most cars' blower motor controls are set to run the fan at low speed
>>>>all the time while the AC compressor is engaged. It's done to keep
>>>>air flowing through the evaporator matrix to prevent ice from building
>>>>up on it.
>>>
>>>
>>>Eh? It gets hot, not cold. ;-)
>>>

>
>
>>Nope. Evaporator gets cold...

>
>
> Which heat exchanger are we talking about? The aux fan runs continually to
> keep the condenser cool. The interior fan may be switched off, as
> there's a probe in that heat exchanger to prevent iceing.
>



I dunno, as I was not the OP. I was just mentioning that evaporators
get cold (and condensers get hot) in the AC scheme.

Fred W
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Car Running HOT, NOW WHAT? HotRod VW water cooled 21 October 16th 05 12:25 PM
'95 Civic Cooling Fan not running DesignGuy Honda 6 January 4th 05 09:16 AM
'01 Stratus heater issues [email protected] Chrysler 10 December 17th 04 01:14 AM
Constantly running cooling fan Walter General 8 February 7th 04 03:12 AM


All times are GMT +1. The time now is 12:00 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AutoBanter.
The comments are property of their posters.