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Volkswagen Golf Mk7 Service & Repair Manual: Control and regulating unit for air conditioning system -J127

The control unit -J127- switches off refrigerant flow through the second evaporator on Volkswagen Golf Mk7 models if the fin temperature approaches the freezing point of water, preventing ice formation.

This control and regulating unit switches off the refrigerant flow through the second evaporator if the temperature at the cooling fins of the second evaporator falls to the freezing point of water (icing protection).
 

Control and regulating unit for air conditioning system -J127

    Questions & answers

    Control and regulating unit for air conditioning system -J127 — Volkswagen Golf Mk7

    What does the Golf Mk7 AC control unit -J127- do?
    Switches off refrigerant flow through the second evaporator if the evaporator temperature drops below a threshold, preventing ice formation.
    Electrical components not installed in refrigerant circuit
    ...

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