What are the symptoms of Hissing from vents and slow loss of refrigerant in Ford Mustang?

No cold air from vents. Weak cabin cooling. Different temperature on both sides of the cabin. Unusual noises when A/C is turned on

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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 Ford Mustang?

Weak or warm air blowing from the vents, inconsistent temperatures on different sides of the cabin, hissing and gurgling sounds from behind the dashboard, and a musty or sweetish chemical smell in the car. The problem is a leak and refrigerant leaking directly from the evaporator core. Repair requires complete disassembly of the dashboard and replacement of the evaporator core itself.

in Ford Mustang (2015-2022)

Symptoms

No cold air from vents
Weak cabin cooling
Different temperature on both sides of the cabin
Unusual noises when A/C is turned on

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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: R1234yf Amount (g): 600g Oil: WSS-M2C300-A2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 100ml

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Hissing from vents and slow loss of refrigerant

Symptoms

A/C Technical Specifications

Other problems in Mustang

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