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Old 21-05-18, 03:59 AM   #1
Senior Member
Join Date: Sep 2016
Location: New Zealand
Posts: 1,134
Default 406 HDi heater control

Currently having issues with a 2002 406hdi where the heater will randomly switch on even if the a/c is on and temp set to 18C. Also does the same thing if the a/c is off.

Have swapped the cabin temp sensor which is up in the overhead console with a known working one and also swapped the heater/aircon control unit in the centre console with a working one, still does not prevent the heater from randomly switching on at full chat..

I am only aware of the cabin having a single temp sensor, that being the one in the overhead console. Wiring schematics I have also only show one. Or have peugeot skilfully hidden one somewhere in the heater box???

Any other ideas what may be causing this random behaviour? First I have come across it.
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