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Asymmetric cooling (driver/passenger different temperature)

Q: What are the symptoms of Asymmetric cooling (driver/passenger different temperature) in Ford F-150 L?

Different temperature on both sides of the cabin. Frost or ice on pipes under the hood

Q: How to fix Asymmetric cooling (driver/passenger different temperature) in Ford F-150 L?

The air conditioning cools perfectly for 15-30 minutes, after which the flow of cold air gradually weakens until it finally stops completely. The blower fan continues to run, but air cannot pass through the ice-blocked evaporator. The problem is caused by a software error or a faulty evaporator temperature sensor. An effective repair involves updating the PCM and HVAC module software (TSB 24-2168 / TSB 24-2212) or physically replacing the entire housing and evaporator core with integrated sensor (TSB 22-2089, TSB 24-2093).

in Ford F-150 L (2015-2024)

Symptoms

Different temperature on both sides of the cabin
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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