OCP temperature sensor N70b1
Thread Starter
Newbie
Joined: Aug 2024
Posts: 5
Likes: 0
w211
OCP temperature sensor N70b1
2005 E320 CDI Estate
Hey guys so I have a problem with AC, but the problem is that on very hot days the AC is blowing too cold! Even if you set the temperature to max (HI) it’s super cold.
I’ve managed to locate that AC module sees about 97oC signal from OCP and 23oC from dash sensor.
Going to the OCP module, the sensor itself senses good temperature. Confirmed it with diagnostic and physically. Something is wrong with the communication between these two modules, does anyone have a diagram?
Could this be a coding issue in central gateway? Since last owner manage to uncode all Central Gateway car options, I did try and fix that up, but not sure if I missed something.
MBWorld Fanatic!
Joined: May 2021
Posts: 2,527
Likes: 2,044
From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Thread Starter
Newbie
Joined: Aug 2024
Posts: 5
Likes: 0
w211
I’ve read somewhere you can access live parameters through the ac controls itself? Maybe I should check the temperatures there?
Are there any reset procedures for the AC unit/or it’s flaps?
MBWorld Fanatic!
Joined: May 2022
Posts: 1,917
Likes: 499
From: The Netherlands
2005 CLS55 AMG W219 C219
If its the same as the W219, then maybe just swap out the thermistor? Its an easy job and the thermistors cost next to nothing. Mine was broken (broken wire)
Out Of Control!!
Joined: Apr 2019
Posts: 11,993
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
screwed up re-programed CGW config
The overhead temp sensor reads well in OCP but AAC module is not picking that up.
Intead a default temp of 97F is assumed by AAC.
Are there any other faults on CAN-B that may prevent AAC from reading OCP ?
Last edited by CaliBenzDriver; Sep 1, 2024 at 03:03 PM.
Thread Starter
Newbie
Joined: Aug 2024
Posts: 5
Likes: 0
w211
Here it's NOT one of the usual issues. CGW configuration was altered.
The overhead temp sensor reads well in OCP but AAC module is not picking that up.
Intead a default temp of 97F is assumed by AAC.
Are there any other faults on CAN-B that may prevent AAC from reading OCP ?
The overhead temp sensor reads well in OCP but AAC module is not picking that up.
Intead a default temp of 97F is assumed by AAC.
Are there any other faults on CAN-B that may prevent AAC from reading OCP ?
Inside OPC module I am getting a good reading from the thermistor.
As I mentioned the Central module was uncoded, I did code it successfully, unless I missed an option or two, have not really found anywhere explaining all the options that are avaible to code, but it seemed straightforward.
I have replaced heater valve a month ago with an aftermarket one, so going to swap it with OEM one this week, since this is usually the culprit.
As I mentioned problem occurs when it is really hot outside (+30oC) and the air conditioning is overfreezing the cabin, to the point I have to turn it off. In the mornings, when it’s about +15oC I do manage to get some heating in the cabin.
I am wondering is there a sheet explaining all Central module options more in-depth?
Last edited by Edvinac; Sep 2, 2024 at 08:05 AM.
Trending Topics
Out Of Control!!
Joined: Apr 2019
Posts: 11,993
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Exactly, I don’t understand maybe my diagnostic tool just cannot interpret the value the AC module is seeing, and I am thinking that something is wrong or the AC module just does not see OPC values.
Inside OPC module I am getting a good reading from the thermistor.
As I mentioned the Central module was uncoded, I did code it successfully, unless I missed an option or two, have not really found anywhere explaining all the options that are avaible to code, but it seemed straightforward.
I have replaced heater valve a month ago with an aftermarket one, so going to swap it with OEM one this week, since this is usually the culprit.
As I mentioned problem occurs when it is really hot outside (+30oC) and the air conditioning is overfreezing the cabin, to the point I have to turn it off. In the mornings, when it’s about +15oC I do manage to get some heating in the cabin.
I am wondering is there a sheet explaining all Central module options more in-depth?
Inside OPC module I am getting a good reading from the thermistor.
As I mentioned the Central module was uncoded, I did code it successfully, unless I missed an option or two, have not really found anywhere explaining all the options that are avaible to code, but it seemed straightforward.
I have replaced heater valve a month ago with an aftermarket one, so going to swap it with OEM one this week, since this is usually the culprit.
As I mentioned problem occurs when it is really hot outside (+30oC) and the air conditioning is overfreezing the cabin, to the point I have to turn it off. In the mornings, when it’s about +15oC I do manage to get some heating in the cabin.
I am wondering is there a sheet explaining all Central module options more in-depth?
you can dig in deeper yourself into this using proprietary documents provided by the WIS system.
I would focus on A/C module
your OCP sensor is working well.
Last edited by CaliBenzDriver; Sep 3, 2024 at 01:06 AM.
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Thread Starter
Newbie
Joined: Aug 2024
Posts: 5
Likes: 0
w211
Have not managed to download WIS yet, but was thinking about it.. I have yet to acquire a good external disk, how much space does it take, and any good resources for the download?
