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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-550 SUPER DUTY?

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-550 SUPER DUTY?

The water condensing on the evaporator flows under the mats onto the passenger floor instead of flowing out of the car. The phenomenon is the result of an incorrectly designed condensate drainage pipe. The repair, according to TSB bulletin 20-2170, involves installing a rubber elbow (part no.: 4M2Z-6A614-AA).

in Ford F-550 SUPER DUTY (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-550 SUPER DUTY

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