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Volkswagen Golf Mk7 Service & Repair Manual: Supplementary heating mode

Once Volkswagen Golf Mk7 coolant temperature reaches approximately 84°C, the auxiliary heater control unit switches to energy-saving mode; above approximately 88°C, it switches off entirely — this page explains that temperature-based control logic.

Once the coolant temperature has reached approx. 84 °C, the control unit switches to energy-saving control mode. If the coolant temperature continues to rise above approx. 88 °C, the control unit switches to the controlled waiting period. If the coolant temperature does not drop below approx. 76 °C within 15 minutes during the controlled waiting period, the heater unit will initiate the start procedure into the standard control mode when the coolant temperature does drop below approx. 76 °C.
   

    Questions & answers

    Supplementary heating mode — Volkswagen Golf Mk7

    How does Golf Mk7 supplementary heating mode work?
    Once coolant reaches ~84°C, the control unit switches to energy-saving cycling. The heater supplements engine heat during cold driving.
    Functional description
    The auxiliary and supplementary heater can be started by means of the remote control, the instant heating button or appropriate programming in the central monitor. Th ...

    Auxiliary heater mode
    Switching on auxiliary heater mode in vehicles with manual air conditioning: –  Press instant heating button-1-.   ...

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