Unplug connector -C- to circulation pump -V55- from auxiliary heater control unit -J364-.
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Detach intake manifold for combustion air -A- → Chapter.
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Use screwdriver to prise cover -B- over connector console off auxiliary heater control unit -J364- → Chapter (dismantling and assembling auxiliary heater).
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Numbering of contacts at connectors -A-, -B-, -C- and in connector housings -D- and -E-