What are the symptoms of Hissing from vents and slow loss of refrigerant in Ford F-150?

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 F-150?

Water (condensate) leaked into the cabin, which resulted in the accumulation of puddles on the floor on the passenger side during or after air conditioning operation. A problem was diagnosed with condensate seeping through the evaporator drain tube gasket into the bulkhead. The fix involved installing a special elbow or using silicone sealant on the drain pipe to direct the water away from the bulkhead seal.

in Ford F-150 (2018-2020)

Symptoms

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

Refrigerant specifications for this model are available in the catalog.

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Hissing from vents and slow loss of refrigerant

Symptoms

A/C Technical Specifications

Other problems in F-150

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