What are the symptoms of Hissing from vents and slow loss of refrigerant in Iveco Daily IV/V/VI?

Air conditioning does not turn on. Problem after collision or accident. Vibrations or humming after turning on A/C

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Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Iveco Daily IV/V/VI?

CABLES: In case of significant diesel vibrations, use additional rubber damping mounts at the engine feet. COMPRESSOR: Check the clutch coil (approx. 3.5-4 ohm) before replacing the compressor. SENSOR: Replacement of the high pressure sensor + check the plug for corrosion. Iveco Daily shares many parts with Fiat Ducato and Citroen Jumper - check interchangeability. Parts under the Fiat name are often 20-40% cheaper.

in Iveco Daily IV/V/VI (2000-2023)

Symptoms

Air conditioning does not turn on
Problem after collision or accident
Vibrations or humming after turning on A/C

DTC error codes

Low pressure / Compressor fault

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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

Mikrobus (Z tylnym parownikiem, tolerancja +/- 50g)

Refrigerant: R134a Amount (g): 1150g Oil: PAG ISO 46 Oil (ml): 240ml

Standardowa pojedyncza kabina (Generacje III-VI)

Refrigerant: R134a Amount (g): 720g Oil: PAG ISO 46 Oil (ml): 150ml

See full specification

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