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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 Alfa Romeo MITO?

Unscrew the old sensor with a tubular wrench and install the new one without draining the gas. This is the best thing about Fiat/Alfa! There is a ball valve (Schrader) in the air conditioning tubes under this sensor. You can unscrew this sensor with your bare hand in the parking lot, it will hiss a bit of gas and lock. You don't have to drain the gas in the workshop to save the pressure switch yourself!

in Alfa Romeo MITO

Symptoms

Hissing from vents

DTC error codes

AC Pressure Sensor Circuit

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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

Standard

Refrigerant: R134a Amount (g): 450g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 130ml

See full specification

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Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in MITO

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