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A/C works intermittently or cuts out during driving

Q: What are the symptoms of A/C works intermittently or cuts out during driving in Fiat Grande Punto 1.9 JTD?

Air conditioning works intermittently. Air conditioning does not turn on. Slow loss of refrigerant

Q: How to fix A/C works intermittently or cuts out during driving in Fiat Grande Punto 1.9 JTD?

Comprehensive repair: New compressor (Denso) with a control valve, replacement of the leaky pipe (cutting), flushing the system, new dryer. In Fiats (especially JTDs), don't rush to the compressor right away. If you replace the hoses/condenser and repair the leak, and the air conditioning still does not start despite the compressor being powered, the culprit is a mechanically jammed capacitive valve. Flushing the system in this case is absolutely necessary.

in Fiat Grande Punto 1.9 JTD (2004-2010)

Symptoms

Air conditioning works intermittently
Air conditioning does not turn on
Slow loss of refrigerant

DTC error codes

Brak specyficznych

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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

Punto (199)

Refrigerant: R134a Amount (g): 480g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 130ml

Punto (199) 1,2 i/1,4 i/1,3 D/1,9 D

Refrigerant: R134a Amount (g): 500g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 130ml

(199)

Refrigerant: R134a Amount (g): 440g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 130ml

See full specification

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