What are the symptoms of Frosting/Freezing of the grilles or evaporator in Ford F-150?

Frost or ice on pipes under the hood

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Frosting/Freezing of the grilles or evaporator

Q: How to fix Frosting/Freezing of the grilles or evaporator in Ford F-150?

The air conditioning initially works properly, but after some time of driving, air stops coming from the air vents, even though you can hear the fan running. The cause is the evaporator freezing into a uniform block of ice due to erroneous temperature sensor readings and a software error. Solution (in accordance with TSB 24-2093 / 22-2089): An effective repair that does not require mechanical disassembly is to update (reflash) the software of the PCM (Powertrain Control Module) and the HVAC module.

in Ford F-150 (2021-2023)

Symptoms

Frost or ice on pipes under the hood

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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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Frosting/Freezing of the grilles or evaporator

Symptoms

A/C Technical Specifications

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