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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

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

Water appeared on the passenger-side floor mats when the air conditioning was on or just after it was turned off. It was diagnosed that the condensate flowing through the evaporator drain pipe was not dripping under the car, but due to the incorrect installation of the drain, it was penetrating back into the cabin through the engine bulkhead gasket. The solution to the problem involved dismantling the drain and installing a special 90-degree rubber elbow that safely directed the condensate away from the vehicle without dismantling the entire cockpit.

in Ford F-150 (2018-2020)

Symptoms

Different temperature on both sides of the cabin
Water dripping into cabin or wet carpets

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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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