Eberspacher External Temp Sensor

harry23uk

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11 Oct 2025
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Hello All,

First post here, apologies if already answered elsewhere.

I have an Eberspacher D5LC installed on the outside coming indoors, however it always runs on max, i believe it is because its pulling in the cold fresh air the temperature outside is starting to get alot colder.

I recently bought an External Eberspacher Temp Sensor, I read that i needed to connect it to the grey wire and brown and white at the plug, however I have two grey wires and one brown and white i have tried connectong to these in various combinations but makes no difference.

Please see photos for better explanation of what im trying to do, I would like to say thank you for taking the time to read and any help is much appreciated as im stuck.

Many thanks,

Harry
 

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Just to add the brown and white is the temp sensor wire however two of these wires go into pin 2 on the ecu and then one to the rheostat and and the plugged connection is two solid grey wires
 
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