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Frosting/Freezing of the grilles or evaporator

Q: How to fix Frosting/Freezing of the grilles or evaporator in Volkswagen Cupra Born?

Replacement of the HVCH module (e.g. 1EA816103D) by a certified HV technician and software update. It's an electric car - there is no 'classic heater with engine fluid'. Worse still, a fault in the HVCH thermal circuit causes the car to hardware-block DC fast chargers.

in Volkswagen Cupra Born (2021-2024)

Symptoms

Frost or ice on pipes under the hood

DTC error codes

Thermal Management Faults

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Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

kompresor Doowon DV9

Refrigerant: R1234yf Amount (g): 330g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 120ml

z silnikiem TSI i kompresorem Doowon DV9

Refrigerant: R1234yf Amount (g): 450g Oil: N 052 535 A0/B0 PAO 68 AA1 Oil (ml): 120ml

kompresor Doowon DV9

Refrigerant: R134a Amount (g): 380g Oil: PAG PAG 46 lub PAO 68 Oil (ml): 120ml

See full specification

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