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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 Maserati GRANTURISMO?

Replace the electromagnetic clutch coil, clutch pulley bearing, and hub assembly. The repair can be carried out from underneath the vehicle after removing the undertray, without evacuating the refrigerant. It is critical to precisely set the air gap between the clutch plate and pulley to 0.4 - 0.6 mm using shim spacers.

in Maserati GRANTURISMO (2007-2018)

Symptoms

Air conditioning stopped cooling / no response to AC button

DTC error codes

B1039

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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

M145 - Zmodernizowane modele 4.7L / S / MC

Refrigerant: R134a / R1234yf Amount (g): 600g Oil: PAG ISO 46 YF Oil (ml): 120ml

M145 - Wczesne modele 4.2L (Początki produkcji)

Refrigerant: R134a Amount (g): 1050g Oil: PAG ISO 46 Oil (ml): 150ml

See full specification

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