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Discussion Starter · #1 ·
Have problems with the air conditioning in our car.
Once it has been parked for a few days, it takes 10-15 minutes before
before the air conditioning starts, and when it does, it gets cold.

Tested with an obd reader that showed: Heat Exchanger Sensor Right N/A.
Where is that valve located?
BMW F11 2013 520D.

Best regards from SWEDEN ;-)
 

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Sensor is connected to pin 12 of A95*1B connector of the Heating/air condition control unit:
1034678


and the other end of the cable is at the sensor, connector B9*1B, pin 1:
1034679


pin 2 of this connector is the ground and it is connected to X224*1V:
1034680

(in this picture you can also see where the unit of the previous picture is located)
 

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Heat exchanger sensor, right
The right-hand heating heat exchanger temperature sensor is a component of the integrated heating / air-conditioning system with left‐right separation. The sensor measures the delivery temperature directly at the delivery side of the heat exchanger for heating system on the passenger's side.
A total of 2 heating heat exchanger temperature sensors are installed (on the delivery side of the heat exchanger for heating system to the driver's side and on the delivery side to the passenger's side). The 2 heating heat exchanger temperature sensors are identical components.
The IHKA control unit (IHKA stands for "integrated automatic heating and air conditioning system") evaluates the signal from the right-hand heating heat exchanger temperature sensor. The IHKA control unit uses this message to regulate the front right stratifying-flap motor.
Functional description
The heating heat exchanger temperature sensor is a hot conductor or NTC resistor (”NTC” stands for ”Negative Temperature Coefficient”). NTC resistors can convert the ”temperature” value into a ”resistance” value, which can then be evaluated electronically. The conductive materials in the NTC resistor conduct current better at high temperatures than at low temperatures. That means: The higher the temperature, the lower the resistance.

ItemExplanationItemExplanation
1Heat exchanger temperature sensor2two‐pin plug connection
Structure and inner electrical connection
The heating heat exchanger temperature sensor is supplied with 5 Volts by the IHKA control unit. To balance inner temperature effects, the NTC resistor is operated at low current. This means that the external ambient temperature is decisive for the resistance value.


ItemExplanation
1NTC resistor
Pin assignments

PinExplanation
5 VSupply voltage
Terminal 31ETerminal 31 E, electronics earth (ground)
Specifications and characteristic curve
Every temperature change at the NTC resistor leads to a change in the voltage signal. The evaluation takes place in the IHKA control unit.


ItemExplanation
1Temperature in degrees Celsius (°C)
2Characteristic curve for hot conductor
3Resistance in kiloohms (kΩ)
Observe the following setpoint values for the heating heat exchanger temperature sensor:

VariableValue
Supply voltage5 V
Temperature range-40 to 85 deg C
Resistance range (measuring range)1.2 to 100 kΩ
Diagnosis instructions
Failure of the component:

If the right heating heat exchanger temperature sensor fails, the following behaviour is to be expected:
  • Fault entry in the IHKA control unit
  • Substitute value of IHKA control unit: 55 °C
 

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Discussion Starter · #4 ·
Amazing, thanks!!!
I will check this at the end of the week.
Best regards Mikael (SWEDEN)
 

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Discussion Starter · #8 ·
Looked at youtube for the location of the sensor.
When they removed the panel I thought that I would see the sensor, but no.
Isn`t it located behind the panel????
A stupid question maybe but I'm not sure right now where it is.

Best regards from SWEDEN.
 

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It should be somewhere behind the panel, but I don't have any more info. I never had the need to look at that space...
 

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Discussion Starter · #13 ·
The sensor has now been replaced.
I removed the panel, just open the hand compartment and pull it out.
The center console sits with two screws, then the same with the CD player.
Inside the lower right corner is the sensor.
Disconnect the cable, push in the brackets on the sensor that holds it in place and pull it out.
1000 thanks to all of you and excuse my possible spelling mistakes ;-)

Best regards from SWEDEN ;-)
 

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Discussion Starter · #16 ·
iCarsoft EU Pro Reader.

Sensor IHKA
vmd.Ids.00024.rex
Ventilation temperature Sensor Left 30`c
Ventilation temperature Sensor Right 31`c
Evaporator temperature Sensor 30,80 `c
Heat exchanger Sensor Left 31`c

Heat exchanger Sensor right N / A.

This sensor was the one I changed.
1036653


Best regards Mikael.
 

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Check the sensor's connector for voltage (5V) and ground and measure the sensor's resistance too (refer to the functional description posted before for the resistance value depending on temperature).
 

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Discussion Starter · #19 ·
I wrote to autodoc and told them about my problem.
They recommended me this sensor to fit my car.
But it looks different.
Has anyone before me put in the wrong sensor?
I'm a little confused right now.
sensor.jpg
 

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What's your VIN, what's the part number you installed and what's the part number autodoc told you to install?
 
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