C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

N70b1 C300

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Mar 18, 2025 | 01:28 PM
  #1  
nautipirate's Avatar
Thread Starter
Junior Member
Photogenic
 
Joined: Oct 2024
Posts: 54
Likes: 3
N70b1 C300

Not sure what this means. It's cold in Iowa but... I pulled the overhead interior sensor/fan and cleaned it. It seems to be working (B10/4 in photo). I could breathe on it, and it goes up. Does anyone know anything about N70b1? I thought that was the overhead sensor but apparently not? Maybe iCarsoft can't read it? Thanks.



Reply
Old Mar 18, 2025 | 03:22 PM
  #2  
Odd Piggy's Avatar
MBWorld Fanatic!
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2013
Posts: 2,377
Likes: 703
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
You have it right. It is the overhead console sensor. Don’t know ranges, though.
Reply
Old Mar 18, 2025 | 06:29 PM
  #3  
JettaRed's Avatar
Banned
Veteran: Army
5 Year Member
Community Influencer
Loved
iTrader: (1)
 
Joined: Nov 2016
Posts: 7,847
Likes: 3,499
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Could you please fully identify your car?
Reply
Old Mar 18, 2025 | 07:58 PM
  #4  
TimC300's Avatar
MBWorld Fanatic!
Community Builder
Liked
Loved
Community Favorite
 
Joined: Aug 2023
Posts: 3,863
Likes: 1,191
From: MA Coast
W204 2010 C300 4matic Sport M272
N70b1 is in the roof. The B10/4 is near the ignition.







Reply
Old Mar 19, 2025 | 10:19 AM
  #5  
nautipirate's Avatar
Thread Starter
Junior Member
Photogenic
 
Joined: Oct 2024
Posts: 54
Likes: 3
Thats strange because I can heat the overhead sensor with a heat gun and B 10/4 value changes a ton. N70b1 stays at -127.99C all the time.
Reply
Old Mar 19, 2025 | 10:58 AM
  #6  
JettaRed's Avatar
Banned
Veteran: Army
5 Year Member
Community Influencer
Loved
iTrader: (1)
 
Joined: Nov 2016
Posts: 7,847
Likes: 3,499
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Sounds like you have a bad N70B1. Are there any apparent problems? Or are you just annoyed knowing there is an impossible reading?

At least it's not reading -273.15°C.
Reply
Old Mar 19, 2025 | 11:16 AM
  #7  
nautipirate's Avatar
Thread Starter
Junior Member
Photogenic
 
Joined: Oct 2024
Posts: 54
Likes: 3
Air conditioner doesn't like that number. If it says it's that cold in the cabin, it doesn't work.
Reply
Old Mar 20, 2025 | 12:41 AM
  #8  
Odd Piggy's Avatar
MBWorld Fanatic!
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2013
Posts: 2,377
Likes: 703
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
Originally Posted by JettaRed
Sounds like you have a bad N70B1. Are there any apparent problems? Or are you just annoyed knowing there is an impossible reading?

At least it's not reading -273.15°C.
@nautipirate Sorry. Didn’t see your last post where A/C isn’t working.

Last edited by Odd Piggy; Mar 20, 2025 at 12:46 AM.
Reply
MB World Stories

The Best of Mercedes & AMG

story-0

New Mercedes-AMG SUVs Arrive With NEW V8 Engine: 12 Things You Need to Know

 Verdad Gallardo
story-1

8 Oddball Mercedes Ideas That Actually Made it to Production

 Verdad Gallardo
story-2

Dubai Tuner Gives the Mercedes G-Class An Entirely New Look

 Verdad Gallardo
story-3

Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish

 
story-4

7 Craziest Things AMG Gas Ever Built

 Verdad Gallardo
story-5

New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

 Verdad Gallardo
story-6

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

 Verdad Gallardo
story-7

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

 Verdad Gallardo
story-8

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-9

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
Old May 19, 2025 | 03:07 PM
  #9  
adidas1977's Avatar
Newbie
 
Joined: May 2025
Posts: 4
Likes: 0
W204 C250 CDI
Originally Posted by nautipirate
Thats strange because I can heat the overhead sensor with a heat gun and B 10/4 value changes a ton. N70b1 stays at -127.99C all the time.
Hello Nautipirate, i have the exact same problem my A/C is not working. It is not getting its 12V, when reading the fault code with icarsoft it also reads out a temperature of -127,99 degrees on the N70b1 interieur temp sensor. I also took out the printboard, and cleaned the sensor but when measuring it was 7.1K ohm, then when heating it up it was dropping to 3.5K ohm. For me it looks it is working. But as i was reading at this forum it still could be the sensor.
Did you replace the sensor and was the reading normal again + a working A/C?
I hope you can help me!

With friendly regards Adidas1977
Reply
Old May 19, 2025 | 04:17 PM
  #10  
nautipirate's Avatar
Thread Starter
Junior Member
Photogenic
 
Joined: Oct 2024
Posts: 54
Likes: 3
My N70B1 still reads bad. When I heat that sensor overhead up, the other temp reading changes (B 10/4). I haven't figured out how to get the dash temp sensor out yet. I want to make sure they are both clean and tested. I get mixed information on the web, so I want to get to both sensors and pull them both up at the same time on the scanner and watch them together. Somewhere on the scanner, you can pull them both up and see them at the same time. My overhead sensor is definitely not the N70B1 according to the scanner. So, I'm still lost.
Reply
Old May 20, 2025 | 01:01 AM
  #11  
adidas1977's Avatar
Newbie
 
Joined: May 2025
Posts: 4
Likes: 0
W204 C250 CDI
Hi, ok if i search for this sensor everywhere i see it is located in the overhead. So thats strange, but you did not replace the overhead sensor i guess? If i have doubt about the overhead sensor and maybe want to place a normal resistor of 1K to see if it will activate my A/C. When i found something i will let you know.
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 03:16 PM.

story-0
New Mercedes-AMG SUVs Arrive With NEW V8 Engine: 12 Things You Need to Know

Slideshow: Mercedes-AMG's updated GLE 63 S and GLS 63 bring a new-generation V8, subtle design revisions, and familiar supercar-rivaling performance figures.

By Verdad Gallardo | 2026-06-17 12:52:51


VIEW MORE
story-1
8 Oddball Mercedes Ideas That Actually Made it to Production

Slideshow: Mercedes has never been afraid to experiment, and some of its strangest ideas turned out to be surprisingly successful.

By Verdad Gallardo | 2026-06-10 17:43:40


VIEW MORE
story-2
Dubai Tuner Gives the Mercedes G-Class An Entirely New Look

Sideshow: A Middle Eastern tuner has transformed the Mercedes-AMG G 63 into an open-top special, replacing nearly every exterior panel in the process.

By Verdad Gallardo | 2026-06-10 15:29:50


VIEW MORE
story-3
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish

Slideshow: Six gift ideas your AMG loving dad or grad will cherish.

By | 2026-06-03 17:26:18


VIEW MORE
story-4
7 Craziest Things AMG Gas Ever Built

Slideshow: Sometimes AMG builds fast sedans. Other times, it builds twin-turbo V12 land missiles and six-wheeled off-road monsters.

By Verdad Gallardo | 2026-05-26 17:59:58


VIEW MORE
story-5
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

Slideshow: Mercedes-AMG's new electric GT 4-Door Coupe trades combustion for software, synthetic noise, and more than 1,100 horsepower.

By Verdad Gallardo | 2026-05-20 20:08:15


VIEW MORE
story-6
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-7
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-8
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-9
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE