the engine fan is on all the time?? - Page 2 - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #11 of 39 (permalink) Old 04-26-2010, 05:30 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Apr 2010
Vehicle: MB C180 W203 2001
Posts: 17
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
the engine fan is on all the time

hello agin
i have het the car on the winter in the front bumper aprox. to the position of the sensor B14, it wasent that bad i have just repent the bumper and thats it, i will try the sensor B12/2 today, and i hope that i well get the problem.
Attached Thumbnails
Click image for larger version

Name:	MB 1.jpg
Views:	5078
Size:	91.9 KB
ID:	304869  
haltamim is offline  
Sponsored Links
Advertisement
 
post #12 of 39 (permalink) Old 04-26-2010, 09:56 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Apr 2010
Vehicle: MB C180 W203 2001
Posts: 17
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Post ambient temperature sensor (B14)

i have just disconnect the sensor B14 and the fan is just shut down wean i blag that agine the engine fan is starting at once, i found the sensor is out of plase? is thes sensor shuld be in his place to work or i have to change it?
thanx allot for all of u.
haltamim is offline  
post #13 of 39 (permalink) Old 04-27-2010, 02:45 AM
BenzWorld Member
 
Date registered: Jul 2008
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 283
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by haltamim View Post
i have just disconnect the sensor B14 and the fan is just shut down wean i blag that agine the engine fan is starting at once, i found the sensor is out of plase? is thes sensor shuld be in his place to work or i have to change it?
thanx allot for all of u.
You can try replace it but you may try unplug the sensor B12 too.
Either one may be the cause.

I think the B14 sensor is the outside temp sensor that climate system use to compared with cabin temp sensor. If the temperature is different, the climate control will decide to blow cold or hot air depended on the temp different.

In case the out side temp is hotter than the cabin inside, the compressor will engage and the fan will operate, the cold air blow to the cabin.

Incase the out side temp is colder than the cabin, the compressor will not operate, the hot water valve will open and blow the hot air to make cabin warm.

About the B12 sensor, it is refrigerant pressure sensor and freon temp sensor in the same body.
When the compressor engage that make high pressure in the freon circuit, the sensor B12 control the fan to be on or off. It is act as fan controller and safety switch. It will cut off the compressor if the pressure is too high.

W203 C200K M111 2002
Denso Iridium IK20
Ground wires SARD
DangTH is offline  
Sponsored Links
Advertisement
 
post #14 of 39 (permalink) Old 04-27-2010, 04:01 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Apr 2010
Vehicle: MB C180 W203 2001
Posts: 17
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
The B12 sensor

but wean i put the climate fan in the cabin on ziro isn't that shut down the compressor and that make no need for the sensor B12 to tern the fan on, abut three monthes ago the tempretur whas (-15 C) and the fan is stell working and the climate system was on the max tempreture (28) and that debent on the whorm water only as i think, any way i will unblag the B12 sensor and see.
thanx for all the answers it was vary helpfull
tanx agine
haltamim is offline  
post #15 of 39 (permalink) Old 04-27-2010, 09:55 AM
BenzWorld Member
 
Date registered: Jul 2008
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 283
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
The fan could be switched on by the engine-radiator temp and the working condition of climate system. It's not too easy to decide.

I think B12 is independently by it's own with some related logic with climate system.
It will still switch the fan on untill freon pressure-temperature drop to the lower level that B12 switch off the fan.
I suspect that the B12 is stick to be on all the time. This may be because of sensor short circuit. You can measure with meter to know it's logic, by pull the plug out and measure the contact pins.

W203 C200K M111 2002
Denso Iridium IK20
Ground wires SARD

Last edited by DangTH; 04-27-2010 at 09:58 AM.
DangTH is offline  
post #16 of 39 (permalink) Old 04-27-2010, 11:23 AM
Outstanding Contributor
 
keyhole's Avatar
 
Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Posts: 11,335
Mentioned: 20 Post(s)
Quoted: 600 Post(s)
haltamim

Assuming that you have engine type 111, your coolant temperature is monitored by a temperature sensor in the coolant thermostat with electrical signals controlling your electric fan. That's where I would look to solve your fan problem.
keyhole is offline  
post #17 of 39 (permalink) Old 04-28-2010, 03:51 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Apr 2010
Vehicle: MB C180 W203 2001
Posts: 17
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
connect to OBD2

i have a freand that he have an OBD2 and he say that i can connect it to my car to run an electrical search, in the manual thear is allot of cods and one of them was abut the sensore B12.
yasterday i drive without the outside temreture sensore and evry think was OK unliss its shown the out tempreture is -40 and i havent any problem weth the engine whorm,i try to get the out temp. sensore agen and the fan start to working, i try to reach the B12 sensor but its start to rigen and i stopet i will do it today hopfuly.
thanx allot for helping me. i am sure that will help other who will get thes problem allso( hopfuly non will get that issue)
Best regards
haltamim is offline  
post #18 of 39 (permalink) Old 04-28-2010, 09:24 AM
BenzWorld Member
 
Date registered: Jul 2008
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 283
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Yes you can check the code
DCT table:
B1226 - In-car temperature sensor (B10/4)
B1227 - Outside temperature indicator temperature sensor (B14)
B1228 - Heater core temperature (B10/1)
B1229 - Heater core temperature (B10/1)
B1230 - Evaporator temperature sensor (B10/6)
B1231 - ECT sensor (B11/4)
B1232 - Refrigerant pressure sensor (B12)
B1233 - Refrigerant temperature sensor (B12/1)
B1234 - Sun sensor (B32)
B1235 - Emissions sensor (B31)
B1241 - Refrigerant fill
B1416 - Coolant circulation pump (M13)
B1417 - Duovalve (Y21y1), left
B1418 - Duovalve (Y21y2), right
B1419 - Electromagnetic clutch (A9k1)
B1420 - Idle speed increase
B1421 - Pulse module (N65)
B1422 - Series interface (K1) connection to instrument cluster (A1)
B1423 - Switchover valve block (Y11)
B1424 - Activated charcoal filter actuator (A32m2) open
B1425 - Activated charcoal filter actuator (A32m2) closed
B1432 - Non-USA DTC
B1459 - Series interface (K2) connection to instrument cluster (A1)
B1462 - Wide open throttle (WOT) position signal: diesel engines

This is for W140 W210
I'm not sure if it the same on W203 or not.

W203 C200K M111 2002
Denso Iridium IK20
Ground wires SARD
DangTH is offline  
post #19 of 39 (permalink) Old 04-28-2010, 09:29 AM
BenzWorld Member
 
Date registered: Jul 2008
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 283
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
I found this from
W203 air conditioning diagnostic mode (C320/C32 only) - MBWorld.org Forums

Push "0" and "EC/REST" button simultaneously until display changes (approx. 5 seconds)

If not work :
On 2002 C32 (digital A/C)
While the vehicle is on and the A/C is in operation, hold down the “REST” button for several seconds until the system goes into the A/C diagnostic mode.


On C32,
Pressing AUTO LEFT Side for 'up' and AUTO RIGHT Side for 'down'

On other C-class A/C,
Pressing “Air up' and 'Air down'
you can shift thru various a/c diagnostic registers.
Cycling through will show you the diagnostic register and its corresponding value.


I've only included the values that may be of interest to owners

00: Interior temp sensor
01: Interior temp sensor
02: Ambient temp sensor
05: Evaporator temp. sensor
06: Engine coolant temp.
07: refrigerant pressure
08: refrigerant temp.
16: carbon monoxide value
17: nitrogen oxide value
18: dewpoint temp.
21: engine RPM
22: vehicle speed
24: battery voltage (very handy)

W203 C200K M111 2002
Denso Iridium IK20
Ground wires SARD

Last edited by DangTH; 04-28-2010 at 09:33 AM.
DangTH is offline  
post #20 of 39 (permalink) Old 04-28-2010, 09:58 AM
BenzWorld Member
 
Date registered: Jul 2008
Vehicle: C200 Kompressor M111 2.0L Avantgarde Year 2002
Location: Thailand
Posts: 283
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
List of Benz OBD2 Code :

OBD Codes - Mercedes Benz Guide and Repair Wiki

W203 C200K M111 2002
Denso Iridium IK20
Ground wires SARD
DangTH is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W203 C-Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Topic Author Forum Replies Last Post
Constant whine from the engine fan/fan clutch? driver450190 W201 190-Class 4 03-27-2010 12:15 PM
Long time fan, first time owner here. mehugtree Unimog 13 12-17-2008 11:12 AM
engine fan or radiator fan fuse and relays ?? DnBtekhnic W203 C-Class 0 04-21-2008 08:40 AM
Aux fan run when Engine fan runs? Is it possible? Haroundb W123 E,CE,D,CD,TD,TE Class 48 07-22-2007 08:17 AM
E430 engine warning lamp lights up from time to time maciek W210 E-Class 2 10-30-2006 05:51 AM

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome