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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?

Different temperature on both sides of the cabin. Water dripping into cabin or wet carpets. Frost or ice on pipes under the hood

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

An ill-fitting factory cover blocks and reverses the drain from the evaporator (TSB 20-2170). The solution is simple: dismantle the right front wheel, tilt the wheel arch and use pliers to remove the locking metal cover protecting the outlet of the condensate evacuation pipe.

in Ford F-150 (2018-2020)

Symptoms

Different temperature on both sides of the cabin
Water dripping into cabin or wet carpets
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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Asymmetric cooling (driver/passenger different temperature)

Symptoms

A/C Technical Specifications

Other problems in F-150

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