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Originally Posted by SD1too
OK, so considering just the petrol models for the moment, is the outside temperature data sent by the IPK via the K bus to the BCU and ATC (HEVAC) ECUs derived from the temperature sensor in the bumper?
Sorry to be persistent about this but I think it's important to be absolutely clear.
Simon
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Originally Posted by
marinabrian 
and the additional ambient temperature sensor as used only on diesel models, mounted on the PAS cooler pipework.
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That is the bimetallic temperature switch which is hardwired into the FBH circuit, its only purpose is to switch on the FBH when the engine is running and the switch is closed at approx 5C air temp.
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Hi Lads
All interesting stuff and great reading for the other members & owners so they know which sensors are being talked about couple of photo's below.
ambient temperature sensor.
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Place it should reside on the front bumper.
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The bimetallic temperature switch, connected to the (FBH) fuel burning heater.
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Close up of the sensor bolted to the PAS pipes by an 8mm bolt
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