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Refrigerant leakage (vibration) and sudden lack of cooling

Q: How to fix Refrigerant leakage (vibration) and sudden lack of cooling in Fiat 124 Spider?

Replacing the cable with a reinforced version of the 3rd generation (16mm, marking B).

in Fiat 124 Spider (2017-2020)

Symptoms

Slow loss of refrigerant

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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

Od 03/

Refrigerant: R1234yf Amount (g): 360g Oil: PAG-46yf Oil (ml): 100ml

Od 03/

Refrigerant: R134a Amount (g): 420g Oil: PAG-46 Oil (ml): 100ml

124 (348)

Refrigerant: R1234yf Amount (g): 360g Oil: PAG 46 YF PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 100ml

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Refrigerant leakage (vibration) and sudden lack of cooling

Symptoms

A/C Technical Specifications

Other problems in 124 Spider

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