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Air conditioning stopped cooling / no response to AC button

Q: How to fix Air conditioning stopped cooling / no response to AC button in Fiat 500C?

Soldering or restoring continuity of the electrical harness at the AC pressure sensor. If the machine shows the pressure in the system, the fuses are intact, and the air conditioning in the Fiat 500 is silent - immediately look under the expansion tank. The thin cables in the bundle wear out there or crack due to age.

in Fiat 500C (2007-2020)

Symptoms

No cold air from vents

DTC error codes

Often none (module does not see problem)

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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

(312)

Refrigerant: R134a Amount (g): 350-400g Oil: PAG 46 Oil (ml): 80 - 110ml

Standard

Refrigerant: R134a Amount (g): 500g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 80ml

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Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in 500C

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