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A/C cooling is weak and gradually loses performance

Q: How to fix A/C cooling is weak and gradually loses performance in Opel Corsa (C/D)?

Replacing the condenser with a new one, cleaning the space between the radiators. PRO TIP (FOR ALL RADIATOR REPLACEMENTS): A cheap (replacement) radiator will often rot in Opel after a year. Before installing a new condenser (especially a cheaper one), always coat it thoroughly with a can of clear coat. This protects raw aluminum against oxidation from road salt and extends the life of the parts several times!

in Opel Corsa (C/D) (1998-2017)

Symptoms

Slow loss of refrigerant

DTC error codes

Brak

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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

F (P2JO)

Refrigerant: R134a Amount (g): 380g Oil: PAG PAO 68 AA1 b.d. Corsa Oil (ml): b.d.ml

Refrigerant: R134a Amount (g): 420g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 80ml

Refrigerant: R134a Amount (g): 470g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 80ml

See full specification

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