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Hissing from vents and slow loss of refrigerant

Q: What are the symptoms of Hissing from vents and slow loss of refrigerant in Jaguar XF Sportbrake (X260)?

No cold air from vents. No blowing from vents. Strange smell in cabin when blower is on. Fogging windows

Q: How to fix Hissing from vents and slow loss of refrigerant in Jaguar XF Sportbrake (X260)?

Full disassembly of the dashboard and replacement of the damaged evaporator core.

in Jaguar XF Sportbrake (X260) (2018-2019)

Symptoms

No cold air from vents
No blowing from vents
Strange smell in cabin when blower is on
Fogging windows

DTC error codes

LTB01120NAS2

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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

2,2 D

Refrigerant: R134a Amount (g): 700g Oil: JLM12260 PAO 68 lub PAG ISO 46 Oil (ml): 110ml

5,0 i/3,0 D

Refrigerant: R134a Amount (g): 750g Oil: JLM12260 PAO 68 lub PAG ISO 46 Oil (ml): 110ml

3,0 i

Refrigerant: R134a Amount (g): 700g Oil: JLM12260 PAO 68 lub PAG ISO 46 Oil (ml): 130ml

See full specification

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