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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 Zafira (B/C)?

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 Zafira (B/C) (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

Life (K0)

Refrigerant: R1234yf Amount (g): 450g Oil: PAG 46 YF PAO 68 AA1 lub PAG ISO 46 YF b.d. Oil (ml): b.d.ml

C (P12)

Refrigerant: R134a Amount (g): 630g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 125ml

C (P12) z silnik: A18XER/A18XFR/A18XEL

Refrigerant: R134a Amount (g): 600g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 125ml

See full specification

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