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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 Pojazdy specjalne Zamiatarka miejska?

SENSOR: In sweepers, the high pressure sensor is often damaged due to vibration. Replacing the sensor + checking the electrical cables. COMPRESSOR: Compressors in special vehicles are often Sanden SD7H15 or York - often repairable. CABLES: Additional rubber silencers at flexible connections. Special vehicles: always look for the serial number on the compressor (Sanden, York, Bitzer). This number allows you to order parts directly from the compressor manufacturer, not just through the vehicle dealer.

in Pojazdy specjalne Zamiatarka miejska (1995-2020)

Symptoms

Air conditioning does not turn on

DTC error codes

Pressure 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

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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