High Priority 100% confidence

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 Corolla Hybrid?

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 Corolla Hybrid?

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 Corolla Hybrid (2010-2025)

Symptoms

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

DTC error codes

B1476

Verifying license...

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

(E21)

Refrigerant: R1234yf Amount (g): 475g Oil: PAG YF PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 80ml

(E21) Hybrid

Refrigerant: R1234yf Amount (g): 475g Oil: ND11 POE 120 GT Oil (ml): 86ml

XII - (E210)

Refrigerant: R1234yf Amount (g): 400-450g Oil: PAG YF ISO 46 Oil (ml): 100 - 130ml

See full specification

Have this problem?

Generate a personalized AI report for your Toyota Corolla Hybrid or book a workshop visit.

Generate AI report Schedule visit

Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Corolla Hybrid

Have this problem?