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Air conditioning stopped cooling / no response to AC button

Q: What are the symptoms of Air conditioning stopped cooling / no response to AC button in Toyota Prius?

No cold air from vents. Frost or ice on pipes under the hood

Q: How to fix Air conditioning stopped cooling / no response to AC button in Toyota Prius?

Only ND-11 (POE) oil - never PAG. When servicing the AC in a Toyota hybrid, check the label on the compressor - if it says 'Electric Compressor' or 'HV' - ND-11 is mandatory. If PAG is contaminated: evacuation, repeated rinsing, replacement of the compressor and dryer. ALWAYS ask the service center before repairing the hybrid air conditioning: 'What oil do you use?' PAG response = change service immediately. Cost of error: PLN 15,000+ vs. PLN 0 with the right oil.

in Toyota Prius (2010-2025)

Symptoms

No cold air from vents
Frost or ice on pipes under the hood

DTC error codes

B1476

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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

1,8 HSD

Refrigerant: R134a Amount (g): 470g Oil: ND11 POE b.d. Prius Oil (ml): b.d.ml

Standard

Refrigerant: R134a Amount (g): 420 – 480g Oil: ND11 POE b.d. Prius Oil (ml): b.d.ml

(NHW11)

Refrigerant: R134a Amount (g): 450 – 550g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 120ml

See full specification

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Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Prius

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