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The air conditioning cools too much / The cabin catches cold

Q: What are the symptoms of The air conditioning cools too much / The cabin catches cold in Toyota Progres?

A/C does not react to control panel settings. Frost or ice on pipes under the hood

Q: How to fix The air conditioning cools too much / The cabin catches cold in Toyota Progres?

Removing the decorative panel of the center console and re-installing/connecting the flexible air intake tube connector to the thermocouple sensor correctly.

in Toyota Progres (1998-2007)

Symptoms

A/C does not react to control panel settings
Frost or ice on pipes under the hood

DTC error codes

B1411 - Room Temp Sensor Circuit

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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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