508 Heating Issues

[KennethLM]

Yeah. But a wire fault would be found with the tester right?
Ill try and take a long drive then measuring the expansion container. Shoulden that be around the temp they said it was.
Just fint it wired they can drive with tester and it says 52. And when k drive home from shop dash is close to 90 degrees.

[KennethLM]

Hallois it possible part nr for the cooling thermostat.
And does this 5008 have 1 or 2 cabin temp sensor?

[GiveMeABreak]

If you're referring to the engine coolant Outlet tank, the sensor is integrated and not shown as a separate part:

(1) Engine Water Outlet Tank, part: 9850364680, £252.44

As for the internal temp. sensor there is only one and I believe this is actually only for monitoring the air quality and no other purpose (it allows the climate system to switch from external to internal air source if it detects road traffic pollution, for example when in a traffic jam). It has nothing to do with the internal temperature as it is my understanding that there are no physical temperature sensors internally to monitor the cabin temperature. This is calculated by the climate system.

(5) Internal Air Temperature Probe, part: 9675593280, £153.39

[KennethLM]

Wau that water outlet tank cost 507£ here i Denmark. So gonna be sure before i change that.

[KennethLM]

The item listet at nr 1 isent that a temp sensor to?

[GiveMeABreak]

No, (1) in the last diagram is the evaporator sensor.

[KennethLM]

Do they sit on both side?
If they do maby 1 of mine is broken

[GiveMeABreak]

No, only one - it just monitors the temperature of the evaporator, to stop it getting too cold where it ices up.

[KennethLM]

Okay tanks

[KennethLM]

Last question .
If that not for cabin temp. How can the car know what temp to reach inside the cabin.
There must be som form of a temp sensor, to guide the mixing of hot and cold air?

[GiveMeABreak]

No it's all rather clever stuff and a bit too much detail to go into here, but basically:-

Passenger compartment temperature sensor
The passenger compartment temperature makes it possible, with the reference value displayed, to determine the temperature adjustment necessary to heat or cool the passenger compartment to the required value.

The passenger compartment temperature is calculated from the following elements:

• External temperature sensor
• Sun sensor
• Air flow and distribution

The calculation depends on several parameters stored when the vehicle stopped, such as:

• Exterior temperature
• Calculated passenger compartment temperature
• Day, date, time, second (this information makes it possible to calculate for how long the vehicle has been stationary)

On this vehicle, the passenger compartment temperature is not measured but calculated from a temperature assessment (Result of the sum of the power added and removed).

This assessment is made for each zone.

[KennethLM]

Its a jungle.
Well ill wait to get my matrix home, then see if this help the hot and cold side.
Flap engien works fine and flaps moving.
Guess i just was wishing for a sensor erro lol

[GavinPJ]

Anyone ever get to the bottom of this? Very very poor heat output on all settings.